A system (from Latin ''systēma'', in turn from Greek '''' systēma, "whole compounded of several parts or members, system", literary "composition") is a set of interacting or interdependent components forming an integrated whole.

A system is a set of elements (often called'' 'components' '') and relationships which are different from relationships of the set or its elements to other elements or sets.

Fields that study the general properties of systems include systems theory, cybernetics, dynamical systems, thermodynamics and complex systems. They investigate the abstract properties of systems' matter and organization, looking for concepts and principles that are independent of domain, substance, type, or temporal scale.

Most systems share common characteristics, including:

Systems have structure, defined by components/elements and their composition;

Systems have behavior, which involves inputs, processing and outputs of material, energy, information, or data;

Systems have interconnectivity: the various parts of a system have functional as well as structural relationships to each other.

Systems may have some functions or groups of functions

The term ''system'' may also refer to a set of rules that governs structure and/or behavior.

History[link]

The word ''system'' in its meaning here, has a long history which can be traced back to Plato (''Philebus''), Aristotle (''Politics'') and Euclid (''Elements''). It had meant "total", "crowd" or "union" in even more ancient times, as it derives from the verb ''sunìstemi'', uniting, putting together.

"System" means "something to look at". You must have a very high visual gradient to have systematization. In philosophy, before Descartes, there was no "system". Plato had no "system". Aristotle had no "system". (Marshall McLuhan in: McLuhan: Hot & Cool. Ed. by Gerald Emanuel Stearn. A Signet Book published by The New American Library, New York, 1967, p. 288).

In the 19th century the first to develop the concept of a "system" in the natural sciences was the French physicist Nicolas Léonard Sadi Carnot who studied thermodynamics. In 1824 he studied the system which he called the ''working substance'', i.e. typically a body of water vapor, in steam engines, in regards to the system's ability to do work when heat is applied to it. The working substance could be put in contact with either a boiler, a cold reservoir (a stream of cold water), or a piston (to which the working body could do work by pushing on it). In 1850, the German physicist Rudolf Clausius generalized this picture to include the concept of the surroundings and began to use the term "working body" when referring to the system.

One of the pioneers of the general systems theory was the biologist Ludwig von Bertalanffy. In 1945 he introduced ''models, principles, and laws that apply to generalized systems or their subclasses, irrespective of their particular kind, the nature of their component elements, and the relation or 'forces' between them.''

Significant development to the concept of a ''system'' was done by Norbert Wiener and Ross Ashby who pioneered the use of mathematics to study systems.

In the 1980s the term complex adaptive system was coined at the interdisciplinary Santa Fe Institute by John H. Holland, Murray Gell-Mann and others.

System concepts[link]

;Environment and boundaries :Systems theory views the world as a complex system of interconnected parts. We scope a system by defining its boundary; this means choosing which entities are inside the system and which are outside - part of the environment. We then make simplified representations (models) of the system in order to understand it and to predict or impact its future behavior. These models may define the structure and/or the behavior of the system.

;Natural and human-made systems :There are natural and human-made (designed) systems. Natural systems may not have an apparent objective but their outputs can be interpreted as purposes. Human-made systems are made with purposes that are achieved by the delivery of outputs. Their parts must be related; they must be “designed to work as a coherent entity” - else they would be two or more distinct systems.

;Theoretical Framework :An open system exchanges matter and energy with its surroundings. Most systems are open systems; like a car, coffeemaker, or computer. A closed system exchanges energy, but not matter, with its environment; like Earth or the project Biosphere2 or 3. An isolated system exchanges neither matter nor energy with its environment. A theoretical example of such system is the Universe.

;Process and transformation process :A system can also be viewed as a bounded transformation process, that is, a process or collection of processes that transforms inputs into outputs. Inputs are consumed; outputs are produced. The concept of input and output here is very broad. E.g., an output of a passenger ship is the movement of people from departure to destination.

;Subsystem :A ''subsystem'' is a set of elements, which is a system itself, and a component of a larger system.

;System Model :A system comprises multiple views. For the man-made systems it may be such views as planning, requirement (analysis), design, implementation, deployment, structure, behavior, input data, and output data views. A system model is required to describe and represent all these multiple views.

;System Architecture :A system architecture, using one single integrated model for the description of multiple views such as planning, requirement (analysis), design, implementation, deployment, structure, behavior, input data, and output data views, is a kind of system model.

Elements of System[link]

Following are considered as the elements of a system in terms of Information systems: -

# Inputs and Outputs # Processor # Control # Environment # Feedback # Boundaries and Interface

Types of systems[link]

Systems are classified in different ways: # Physical or Abstract systems # Open or Closed systems # 'Man-made' Information systems # Formal Information systems # Informal Information systems # Computer Based Information systems # Real Time System

Physical systems are tangible entities that may be static or dynamic in operation.

An open system has many interfaces with its environment. i.e. system that interacts freely with its environment, taking input and returning output. It permits interaction across its boundary; it receives inputs from and delivers outputs to the outside. A closed system does not interact with the environment; changes in the environment and adaptability are not issues for closed system.

Analysis of systems[link]

Evidently, there are many types of systems that can be analyzed both quantitatively and qualitatively. For example, with an analysis of urban systems dynamics, [A.W. Steiss] defines five intersecting systems, including the physical subsystem and behavioral system. For sociological models influenced by systems theory, where Kenneth D. Bailey defines systems in terms of conceptual, concrete and abstract systems; either isolated, closed, or open, Walter F. Buckley defines social systems in sociology in terms of mechanical, organic, and process models. Bela H. Banathy cautions that with any inquiry into a system that understanding the type of system is crucial and defines Natural and Designed systems.

In offering these more global definitions, the author maintains that it is important not to confuse one for the other. The theorist explains that natural systems include sub-atomic systems, living systems, the solar system, the galactic system and the Universe. Designed systems are our creations, our physical structures, hybrid systems which include natural and designed systems, and our conceptual knowledge. The human element of organization and activities are emphasized with their relevant abstract systems and representations. A key consideration in making distinctions among various types of systems is to determine how much freedom the system has to select purpose, goals, methods, tools, etc. and how widely is the freedom to select itself distributed (or concentrated) in the system.

George J. Klir maintains that no "classification is complete and perfect for all purposes," and defines systems in terms of abstract, real, and conceptual physical systems, bounded and unbounded systems, discrete to continuous, pulse to hybrid systems, et cetera. The interaction between systems and their environments are categorized in terms of relatively closed, and open systems. It seems most unlikely that an absolutely closed system can exist or, if it did, that it could be known by us. Important distinctions have also been made between hard and soft systems. Hard systems are associated with areas such as systems engineering, operations research and quantitative systems analysis. Soft systems are commonly associated with concepts developed by Peter Checkland and Brian Wilson through Soft Systems Methodology (SSM) involving methods such as action research and emphasizing participatory designs. Where hard systems might be identified as more "scientific," the distinction between them is actually often hard to define.

Cultural system[link]

A cultural system may be defined as the interaction of different elements of culture. While a cultural system is quite different from a social system, sometimes both systems together are referred to as the sociocultural system. A major concern in the social sciences is the problem of order. One way that social order has been theorized is according to the degree of integration of cultural and social factors.

Economic system[link]

An economic system is a mechanism (social institution) which deals with the production, distribution and consumption of goods and services in a particular society. The economic system is composed of people, institutions and their relationships to resources, such as the convention of property. It addresses the problems of economics, like the allocation and scarcity of resources.

Application of the system concept[link]

Systems modeling is generally a basic principle in engineering and in social sciences. The system is the representation of the entities under concern. Hence inclusion to or exclusion from system context is dependent of the intention of the modeler.

No model of a system will include all features of the real system of concern, and no model of a system must include all entities belonging to a real system of concern.

Systems in information and computer science[link]

In computer science and information science, system is a software system which has components as its structure and observable Inter-process communications as its behavior. Again, an example will illustrate: There are systems of counting, as with Roman numerals, and various systems for filing papers, or catalogues, and various library systems, of which the Dewey Decimal System is an example. This still fits with the definition of components which are connected together (in this case in order to facilitate the flow of information).

System can also be used referring to a framework, be it software or hardware, designed to allow software programs to run, see platform.

Systems in engineering and physics[link]

In engineering and physics, a physical system is the portion of the universe that is being studied (of which a thermodynamic system is one major example). Engineering also has the concept of a system that refers to all of the parts and interactions between parts of a complex project. Systems engineering refers to the branch of engineering that studies how this type of system should be planned, designed, implemented, built, and maintained.

Systems in social and cognitive sciences and management research[link]

Social and cognitive sciences recognize systems in human person models and in human societies. They include human brain functions and human mental processes as well as normative ethics systems and social/cultural behavioral patterns.

In management science, operations research and organizational development (OD), human organizations are viewed as systems (conceptual systems) of interacting components such as subsystems or system aggregates, which are carriers of numerous complex business processes (organizational behaviors) and organizational structures. Organizational development theorist Peter Senge developed the notion of organizations as systems in his book ''The Fifth Discipline''.

Systems thinking is a style of thinking/reasoning and problem solving. It starts from the recognition of system properties in a given problem. It can be a leadership competency. Some people can ''think globally while acting locally''. Such people consider the potential consequences of their decisions on other parts of larger systems. This is also a basis of systemic coaching in psychology.

Organizational theorists such as Margaret Wheatley have also described the workings of organizational systems in new metaphoric contexts, such as quantum physics, chaos theory, and the self-organization of systems.

Systems applied to strategic thinking[link]

In 1988, military strategist, John A. Warden III introduced his Five Ring System model in his book, ''The Air Campaign'' contending that any complex system could be broken down into five concentric rings. Each ring—Leadership, Processes, Infrastructure, Population and Action Units—could be used to isolate key elements of any system that needed change. The model was used effectively by Air Force planners in the First Gulf War. In the late 1990s, Warden applied this five ring model to business strategy.

See also[link]

;Examples of systems

List of systems (WikiProject)

physical system

conceptual system

Complex system

Formal system

Information system

Meta-system

Solar System

Systems in human anatomy

Market

;Theories about systems

Chaos theory

Cybernetics

Systems ecology

Systems engineering

Systems psychology

Systems theory

Thermodynamic systems

Control theory

;Related topics

Glossary of systems theory

Complexity theory and organizations

Black box

System of systems (engineering)

Systems art

References[link]

Further reading[link]

Alexander Backlund (2000). "The definition of system". In: ''Kybernetes'' Vol. 29 nr. 4, pp. 444–451.

Kenneth D. Bailey (1994). ''Sociology and the New Systems Theory: Toward a Theoretical Synthesis''. New York: State of New York Press.

Bela H. Banathy (1997). "A Taste of Systemics", ISSS The Primer Project.

Walter F. Buckley (1967). '' Sociology and Modern Systems Theory'', New Jersey: Englewood Cliffs.

Peter Checkland (1997). ''Systems Thinking, Systems Practice''. Chichester: John Wiley & Sons, Ltd.

Robert L. Flood (1999). ''Rethinking the Fifth Discipline: Learning within the unknowable''. London: Routledge.

George J. Klir (1969). Approach to General Systems Theory, 1969.

Brian Wilson (1980). ''Systems: Concepts, methodologies and Applications'', John Wiley

Brian Wilson (2001). ''Soft Systems Methodology—Conceptual model building and its contribution'', J.H.Wiley.

Beynon-Davies P. (2009). ''Business Information + Systems''. Palgrave, Basingstoke. ISBN 978-0-230-20368-6

External links[link]

''Definitions of Systems and Models'' by Michael Pidwirny, 1999-2007.

''Definitionen von "System" (1572-2002)'' by Roland Müller, 2001-2007 (most in German).

Theory and Practical Exercises of System Dynamics by Juan Martin (also in Spanish)

Category:Cybernetics Category:Systems theory Category:Systems science Category:Greek loanwords

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region	Western Philosophy
Era	20th century philosophy
Color	#B0C4DE
image	Mckenna1.jpg
name	Terence Kemp McKenna
Birth date	November 16, 1946
Birth place	Paonia, Colorado, United States
Death date	April 03, 2000
Death place	San Rafael, California, United States
School tradition	Metaphysics, phenomenology|
Main interests	shamanism, ethnobotany, metaphysics, psychedelic drugs, futurism, primitivism, environmentalism, consciousness, phenomenology, historical revisionism, evolution, ontology, Mind at Large, virtual reality, dominator culture, criticizing science, the Logos
Influences	psychedelic drugs, Marshall McLuhan, Alfred North Whitehead, Teilhard de Chardin, Aldous Huxley, I Ching, William Blake, Riane Eisler, James Joyce, Vladimir Nabokov, Heraclitus
Influenced	Rupert Sheldrake, Robert Anton Wilson, Ralph Abraham, RU Sirius, Cliff Pickover, Timothy Leary
Notable ideas	Novelty Theory, The "Stoned Ape" Theory of Human Evolution, Machine elves }}

Terence Kemp McKenna (November 16, 1946 – April 3, 2000) was an American philosopher, psychonaut, researcher, teacher, lecturer and writer on many subjects, such as human consciousness, language, psychedelic drugs, the evolution of civilizations, the origin and end of the universe, alchemy, and extraterrestrial beings.

Biography[link]

Early life[link]

Terence McKenna grew up in Paonia, Colorado. He was introduced to geology through his uncle and developed a hobby of solitary fossil hunting in the arroyos near his home. From this he developed a deep artistic and scientific appreciation of nature.

At age 16, McKenna moved to Los Altos, California to live with family friends for a year. He finished high school in Lancaster, CA. In 1963, McKenna was introduced to the literary world of psychedelics through ''The Doors of Perception'' and ''Heaven and Hell'' by Aldous Huxley and certain issues of ''The Village Voice'' that talked about psychedelics.

McKenna claimed that one of his early psychedelic experiences with morning glory seeds showed him "that there was something there worth pursuing." In an audio interview Terence Mckenna claims to have started smoking cannabis regularly during the summer following his 17th birthday.

Studying and traveling[link]

In 1965, McKenna enrolled in the University of California, Berkeley to study art history. In 1967, while in college, he discovered and begun studying shamanism through the study of Tibetan folk religion. That year, which he called his "opium and kabbala phase" he also traveled to Jerusalem, where he met Kathleen Harrison, who would later become his wife.

In 1969, McKenna traveled to Nepal led by his "interest in Tibetan painting and hallucinogenic shamanism." During his time there, he studied the Tibetan language and worked as a hashish smuggler, until "one of his Bombay-to-Aspen shipments fell into the hands of U. S. Customs." He was forced to move to avoid capture by Interpol. He wandered through Southeast Asia viewing ruins, collected butterflies in Indonesia, and worked as an English teacher in Tokyo. He then went back to Berkeley to continue studying biology, which he called "his first love".

After the partial completion of his studies, and his mother's death from cancer in 1971, McKenna, his brother Dennis, and three friends traveled to the Colombian Amazon in search of ''oo-koo-hé'', a plant preparation containing dimethyltryptamine (DMT). Instead of oo-koo-hé they found various forms of ''ayahuasca'', or ''yagé'', and gigantic ''Psilocybe cubensis'' which became the new focus of the expedition. In La Chorrera, at the urging of his brother, he was the subject of a psychedelic experiment which he claimed put him in contact with "Logos": an informative, divine voice he believed was universal to visionary religious experience. The voice's reputed revelations and his brother's simultaneous peculiar experience prompted him to explore the structure of an early form of the I Ching, which led to his "Novelty Theory". During their stay in the Amazon, McKenna also became romantically involved with his translator, Ev.

In 1972, McKenna returned to Berkeley to finish his studies. There he decided to switch majors to a Bachelor of Science in ecology and conservation, in a then new experimental section of the same university called the Tussman Experimental College. During his studies, he would also develop techniques for cultivating psilocybin mushrooms with Dennis.

In 1975, he parted with his girlfriend, Ev, when she left him for one of his friends from Berkeley. Their parting left him "tormented with migraines and living alone". He graduated in 1975. That same year, he began a relationship with Kathleen Harrison, whom he had met in Jerusalem.

Soon after graduating, McKenna and Dennis published a book inspired by their Amazon experiences, ''The Invisible Landscape: Mind, Hallucinogens and the I Ching''. He also began lecturing. The brothers' experiences in the Amazon would later play a major role in McKenna's book ''True Hallucinations'', published in 1993. In 1976, the brothers published what they had learned about the cultivation of mushrooms in a book entitled ''Psilocybin - Magic Mushroom Grower's Guide'' under the pseudonyms "OT Oss" and "ON Oeric".

Later life[link]

In the early 1980s, McKenna began to speak publicly on the topic of psychedelic drugs, lecturing extensively and conducting weekend workshops. Though associated with the New Age and human potential movements, McKenna himself had little patience for New Age sensibilities. He repeatedly stressed the importance and primacy of felt experience, as opposed to dogma. Timothy Leary once introduced him as "one of the five or six most important people on the planet." }}He soon became a fixture of popular counterculture. His growing popularity culminated in the early-to-mid-1990s with the publication of several books: ''True Hallucinations'', relating the tale of his 1971 La Chorrera experience; ''Food of the Gods''; and ''The Archaic Revival''. He became a popular personality in the psychedelic rave/dance scene of the early 1990s, with frequent spoken word performances at raves and contributions to psychedelic and goa trance albums by The Shamen, Spacetime Continuum, Alien Project, Capsula, Entheogenic, Zuvuya, Shpongle, and Shakti Twins. His speeches were, and are, sampled by many. In 1994 he appeared as a speaker at the Starwood Festival, documented in the book ''Tripping'' by Charles Hayes. His lectures were produced on both cassette tape and CD.

McKenna was a colleague of chaos mathematician Ralph Abraham, and biologist Rupert Sheldrake, creator of the theory of "morphogenetic fields", not to be confused with the mainstream usage of the same term. He conducted several public debates known as ''trialogues'' with them from the late 1980s until his death. Books containing transcriptions of some of these events were published. He was also a friend and associate of Ralph Metzner, Nicole Maxwell, and Riane Eisler, participating in joint workshops and symposia with them. He was a personal friend of Tom Robbins, and influenced the thought of many scientists, writers, artists, and entertainers. His influences include comedian Bill Hicks, whose routines about psychedelic drugs drew heavily from McKenna's works. He is also the inspiration for the Twin Peaks character Dr. Jacoby.

In addition to psychedelic drugs, McKenna spoke on the subjects of virtual reality, which he saw as a way to artistically communicate the experience of psychedelics; techno-paganism; artificial intelligence; evolution; extraterrestrials; and aesthetic theory, specifically about art/visual experience as ''information'' representing the significance of hallucinatory visions experienced under the influence of psychedelics.

In 1985, McKenna co-founded Botanical Dimensions with his then-wife Kathleen, a nonprofit ethnobotanical preserve in Hawaii, where he lived for many years before he died. In 1997 he and Kathleen divorced. Before moving to Hawaii permanently, McKenna split his time between Hawaii and Occidental, located in the redwood-studded hills of Sonoma County, California.

Death[link]

A longtime sufferer of migraines, in mid-1999 McKenna returned to his home on the big island of Hawaii after a long lecturing tour. He began to suffer from increasingly painful headaches. This culminated in three brain seizures in one night, which he claimed were the most powerful psychedelic experiences he had ever known. Upon his emergency trip to the hospital on Oahu, Terence was diagnosed with glioblastoma multiforme, a highly aggressive form of brain cancer. For the next several months he underwent various treatments, including experimental gamma knife radiation treatment. According to Wired magazine, McKenna was worried that his tumour was caused by his 35-years of smoking cannabis; though his doctors assured him there was no causal relation.

In late 1999, Erik Davis conducted what would be the last interview of McKenna. During the interview McKenna also talked about the announcement of his death:

McKenna died on April 3, 2000, at the age of 53, with his loved ones at his bedside. He is survived by his brother Dennis, his son Finn, and his daughter Klea.

Library fire[link]

On February 7, 2007, McKenna's library of rare books and personal notes was destroyed in a fire which burned offices belonging to Big Sur's Esalen Institute which was storing the collection. An index maintained by his brother Dennis survives, though little else.

Ideas[link]

Terence McKenna advocated the exploration of altered states of mind via the ingestion of naturally occurring psychedelic substances. For example, and in particular, as facilitated by the ingestion of high doses of psychedelic mushrooms, and DMT, which he believed was the apotheosis of the psychedelic experience. He spoke of the "jeweled, self-dribbling basketballs" or "self-transforming machine elves" that one encounters in that state.

Although he avoided giving his allegiance to any one interpretation (part of his rejection of monotheism), he was open to the idea of psychedelics as being "trans-dimensional travel"; literally, enabling an individual to encounter what could be ancestors, or spirits of earth. He remained opposed to most forms of organized religion or guru-based forms of spiritual awakening.

Either philosophically or religiously, he expressed admiration for Marshall McLuhan, Pierre Teilhard de Chardin, Gnostic Christianity, Alfred North Whitehead and Alchemy. McKenna always regarded the Greek philosopher Heraclitus as his favorite philosopher.

He also expressed admiration for the works of James Joyce (calling ''Finnegans Wake'' "the quintessential work of art, or at least work of literature of the 20th century") and Vladimir Nabokov: McKenna once said that he would have become a Nabokov lecturer if he had never encountered psychedelics.

==="Stoned Ape" theory of human evolution=== In his book ''Food of the Gods'', McKenna proposed that the transformation from humans' early ancestors ''Homo erectus'' to the species ''Homo sapiens'' mainly had to do with the addition of the mushroom ''Psilocybe cubensis'' in its diet - an event which according to his theory took place in about 100,000 BC (this is when he believed that the species diverged from the Homo genus). He based his theory on the main effects, or alleged effects, produced by the mushroom. One of the effects that comes about from the ingestion of low doses, which agrees with one of scientist Roland Fischer's findings from the late 1960s-early 1970s, is it significantly improves the visual acuity of humans - so theoretically, of other human-like mammals too. According to McKenna, this effect would have definitely proven to be of evolutionary advantage to humans' omnivorous hunter-gatherer ancestors that would have stumbled upon it "accidentally"; as it would make it easier for them to hunt.

In higher doses, McKenna claims, the mushroom acts as a sexual stimulator, which would make it even more beneficial evolutionarily, as it would result in more offspring. At even higher doses, the mushroom would have acted to "dissolve boundaries", which would have promoted community-bonding and group sexual activities-that would result in a mixing of genes and therefore greater genetic diversity. Generally McKenna believed that the periodic ingestion of the mushroom would have acted to dissolve the ego in humans before it ever got the chance to grow in destructive proportions. In this context, he likened the ego to a cancerous tumor that can grow uncontrollable and become destructive to its host. In his own words:

The mushroom, according to McKenna, had also given humans their first truly religious experiences (which, as he believed, were the basis for the foundation of all subsequent religions to date). Another factor that McKenna talked about was the mushroom's potency to promote linguistic thinking. This would have promoted vocalisation, which in turn would have acted in cleansing the brain (based on a scientific theory that vibrations from speaking cause the precipitation of impurities from the brain to the cerebrospinal fluid), which would further mutate the brain. All these factors according to McKenna were the most important factors that promoted evolution towards the ''Homo sapiens'' species. After this transformation took place, the species would have begun moving out of Africa to populate the rest of the planet Later on, this theory by McKenna was given the name "The 'Stoned Ape' Theory of Human Evolution".

Novelty theory[link]

McKenna's ''Timewave zero'' is a numerological formula that purports to calculate the ebb and flow of "novelty", defined as increase over time in the universe's interconnectedness, or organized complexity. According to McKenna, the universe has a teleological attractor at the end of time that increases interconnectedness, eventually reaching a singularity of infinite complexity in 2012, at which point anything and everything imaginable will occur simultaneously. He conceived this idea over several years in the early to mid-1970s while using psilocybin and DMT.

McKenna expressed "novelty" in a computer program which purportedly produces a waveform known as "timewave zero" or the "timewave". Based on McKenna's interpretation of the King Wen sequence of the ''I Ching'', the graph appears to show great periods of novelty corresponding with major shifts in humanity'sbiological and sociocultural evolution. He believed that the events of any given time are recursively related to the events of other times, and chose the atomic bombing of Hiroshima as the basis for calculating his end date of November 2012. When he later discovered this date's proximity to the end of the 13th b'ak'tun of the Maya calendar, he revised his hypothesis so that the two dates matched.

The 1975 first edition of ''The Invisible Landscape'' refers to 2012 (but no specific day during the year) only twice. In the 1993 second edition, McKenna employed Sharer's date of 21 December 2012 throughout.

Bibliography[link]

1975 - ''The Invisible Landscape: Mind, Hallucinogens, and the I Ching'' (with Dennis McKenna) (Seabury; 1st Ed) ISBN 0-8164-9249-2.

1976 - ''The Invisible Landscape'' (with Dennis McKenna, and Quinn Taylor) (Scribner) ISBN 0-8264-0122-8

1976 - ''Psilocybin - Magic Mushroom Grower's Guide'' (with Dennis McKenna: credited under the pseudonyms OT Oss and ON Oeric) (2nd edition 1986) (And/Or Press) ISBN 0-915904-13-6

1992 - ''Psilocybin - Magic Mushroom Grower's Guide'' (with Dennis McKenna: (credited under the pseudonyms OT Oss and ON Oeric) (Quick American Publishing Company; Revised edition) ISBN 0-932551-06-8

1992 - ''The Archaic Revival'' (HarperSanFrancisco; 1st edition) ISBN 0-06-250613-7

1992 - ''Food of the Gods: The Search for the Original Tree of Knowledge - A Radical History of Plants, Drugs, and Human Evolution'' (Bantam) ISBN 0-553-37130-4

1992 - ''Synesthesia'' (with Timothy C. Ely) (Granary Books 1st Ed) ISBN 1-887123-04-0

1992 - ''Trialogues at the Edge of the West: Chaos, Creativity, and the Resacralization of the World'' (with Ralph H. Abraham, Rupert Sheldrake and Jean Houston) (Bear & Company Publishing 1st Ed) ISBN 0-939680-97-1

1993 - ''True Hallucinations: Being an Account of the Author’s Extraordinary Adventures in the Devil’s Paradise'' (HarperSanFrancisco 1st Ed) ISBN 0-06-250545-9

1994 - ''The Invisible Landscape'' (HarperSanFrancisco; Reprint edition) ISBN 0-06-250635-8

1998 - ''True Hallucinations & the Archaic Revival: Tales and Speculations About the Mysteries of the Psychedelic Experience'' (Fine Communications/MJF Books) (Hardbound) ISBN 1-56731-289-6

1998 - ''The Evolutionary Mind : Trialogues at the Edge of the Unthinkable'' (with Rupert Sheldrake and Ralph H. Abraham) (Trialogue Press; 1st Ed) ISBN 0-942344-13-8

1999 - ''Food of the Gods: A Radical History of Plants, Drugs, and Human Evolution'' (Rider & Co; New edition) ISBN 0-7126-7038-6

1999 - ''Robert Venosa: Illuminatus'' (with Robert Venosa, Ernst Fuchs, H. R. Giger, and Mati Klarwein) (Craftsman House) ISBN 90-5703-272-4

2001 - ''Chaos, Creativity, and Cosmic Consciousness'' (with Rupert Sheldrake and Ralph H. Abraham) (Park Street Press; revised ed) ISBN 0-89281-977-4 (Revised edition of Trialogues at the Edge of the West)

2005 - ''The Evolutionary Mind: Trialogues on Science, Spirit & Psychedelics'' (Monkfish Book Publishing; Revised Ed) ISBN 0-9749359-7-2

Spoken word[link]

''History Ends In Green: Gaia, Psychedelics and the Archaic Revival'', 6 audiocassette set, Mystic Fire audio, 1993, ISBN 1-56176-907-X (recorded at the Esalen Institute, 1989)

''TechnoPagans at the End of History'' (transcription of rap with Mark Pesce from 1998)

''Psychedelics in the Age of Intelligent Machines'' (1999) 90 minutes video

''Alien Dreamtime'' with Spacetime Continuum & Stephen Kent (Magic Carpet Media) (CD) video

''Conversations on the Edge of Magic'' (1994) (CD & Cassette) ACE

''Rap-Dancing Into the Third Millennium'' (1994) (Cassette) (Re-issued on CD as ''The Quintessential Hallucinogen'') ACE

''Packing For the Long Strange Trip'' (1994) (Cassette) ACE

Coast to Coast AM with Art Bell, broadcast on May 22, 1997, Five hour interview covering various topics

''Global Perspectives and Psychedelic Poetics'' (1994) (Cassette) Sound Horizons Audio-Video, Inc.

''The Search for the Original Tree of Knowledge'' (1992) (Cassette) Sounds True

Discography[link]

''Re : Evolution'' with The Shamen (1992)

Terence McKenna & Zuvuya - Dream Matrix Telemetry (1993)

''Alien Dreamtime'' with Spacetime Continuum & Stephen Kent (Magic Carpet Media) (DVD)

2009 - ''Cognition Factor'' (2009)

Notes[link]

Coe's initial date was "24 December 2011." He revised it to "11 January AD 2013" in the 1980 2nd edition of his book, not settling on 23 December 2012 until the 1984 3rd edition. The correlation of b'ak'tun 13 as 21 December 2012 first appeared in Table B.2 of Robert J. Sharer's 1983 revision of the 4th edition of Sylvanus Morley's book ''The Ancient Maya''.

References[link]

External links[link]

Terence McKenna Land at Deoxy.org

Terence McKenna at Levity.com

Erowid's Terence McKenna Vault

Botanical Dimensions

Rotten.com bio

FloatingWorldWeb's McKenna Pages

Terence McKenna's Last Trip 2000 Wired Magazine article by Erik Davis

"Mind contagions" (2001) at disinfo.com

Psychedelics, Evolution & Fun 2008 essay by Patrick Lundborg

Machine Elves 101, or Why Terence McKenna Matters - Reallity Sandwish by Daniel Moler

Transcription from 1991 interview regarding cannabis

Audio and video resources[link]

Terence McKenna's interview Conducted by John Hazard in October 1998

Audio and video archive at Deoxy.org

Terence McKenna media archive at EROCx1.com

FutureHi.net MP3 Downloads - Terence McKenna, Albert Hoffman, Robert Anton Wilson, and more

McKenna at the 1999 Entheobotany Seminar - Audio Podcast

Psychedelics in the Age of Intelligent Machines - Video samples from the 1999 DVD

McKenna Video on FloatingWorldWeb - McKenna Video Portal

Over 100 podcasts of Terence McKenna talks - Audio Podcast

Transcripts[link]

MindofMcKenna - McKenna audio excerpts, transcriptions and quotes

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