Blue

Blue is the colour between violet and green on the optical spectrum of visible light. Human eyes perceive blue when observing light with a wavelength between 450 and 495 nanometres. Blues with a higher frequency and thus a shorter wavelength gradually look more violet, while those with a lower frequency and a longer wavelength gradually appear more green. Pure blue, in the middle, has a wavelength of 470 nanometres. In painting and traditional colour theory, blue is one of the three primary colours of pigments, along with red and yellow, which can be mixed to form a wide gamut of colours. Red and blue mixed together form violet, blue and yellow together form green. Blue is also a primary colour in the RGB colour model, used to create all the colours on the screen of a television or computer monitor.

The modern English word blue comes from Middle English bleu or blewe, from the Old French bleu, a word of Germanic origin, related to the Old High German word blao. The clear sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. When sunlight passes through the atmosphere, the blue wavelengths are scattered more widely by the oxygen and nitrogen molecules, and more blue comes to our eyes. Rayleigh scattering also explains blue eyes; there is no blue pigment in blue eyes. Distant objects appear more blue because of another optical effect called atmospheric perspective.

Fantasy

Fantasy is a genre of fiction that uses magic or other supernatural elements as a main plot element, theme, or setting. Many works within the genre take place in imaginary worlds where magic and magical creatures are common. Fantasy is generally distinguished from the genres of science fiction and horror by the expectation that it steers clear of scientific and macabre themes, respectively, though there is a great deal of overlap between the three, all of which are subgenres of speculative fiction.

In popular culture, the fantasy genre is predominantly of the medievalist form. In its broadest sense, however, fantasy comprises works by many writers, artists, filmmakers, and musicians, from ancient myths and legends to many recent and popular works.

Fantasy is studied in a number of disciplines including English and other language studies, cultural studies, comparative literature, history, and medieval studies. Work in this area ranges widely, from the structuralist theory of Tzvetan Todorov, which emphasizes the fantastic as a liminal space, to work on the connections (political, historical, literary) between medievalism and popular culture.

Unknown

Unknown or The Unknown may refer to:

Mathematics

Film

Music

Other uses

Granblue Fantasy

Granblue Fantasy (グランブルーファンタジー, Guranburū Fantajī) is a role-playing video game developed by Cygames for Android and iOS platforms, and released in Japan on March 10, 2014. The game is notable for reuniting two key staff from the development of Final Fantasy VI and Final Fantasy IX, music composer Nobuo Uematsu and character artist Hideo Minaba.

Gameplay

The game plays as a traditional Japanese role-playing video game with turn-based battles. The game also contains summons and a class system that alters the main character's move-set and growth. Characters gain levels and abilities by accruing experience; summons and weapons equipped also confer characters with bonuses on attack power and HP. The characters themselves are gained either via quests (the main story quests or special event quests) or by using in-game currency to receive random crystal fragments, which may contain special weapons that add specific characters to the party. Characters, summons, and weapons are ranked (from best to worst) as SSR, SR, R, or N; each is also of type wind, water, fire, earth, light, or darkness. Voice actors provide voices for all of the characters in battle, and for much of the main and event storylines.

Military tactics

Military tactics are the science and art of organizing a military force, and the techniques for combining and using weapons and military units to engage and defeat an enemy in battle. Changes in philosophy and technology have been reflected in changes to military tactics; in contemporary military science tactics are the lowest of three planning levels: (i) strategic, (ii) operational, and (iii) tactical. The highest level of planning is strategy, how force is translated into political objectives, by bridging the means and ends of war. The intermediate level, operational level, the conversion of strategy into tactics deals with formations of units. In the vernacular, tactical decisions are those made to achieve the greatest, immediate value, and strategic decisions are those made to achieve the greatest, overall value, irrespective of the immediate results of a tactical decision.

Concept

Military tactics answer the questions of how best to deploy and employ forces on a small scale. Some practices have not changed since the dawn of warfare: ambushes, seeking and turning flanks, maintaining reconnaissance, creating and using obstacles and defences, etc. Using ground to best advantage has not changed much either. Heights, rivers, swamps, passes, choke points, and natural cover, can all be used in multiple ways. Before the nineteenth century, many military tactics were confined to battlefield concerns: how to maneuver units during combat in open terrain. Nowadays, specialized tactics exist for many situations, for example for securing a room in a building.