Dance theory refers to the philosophies underpinning contemporary dance, including formal ideologies, aesthetic concepts, and technical attributes. It is a fairly new field of study, developing largely in the 20th Century. It can be considered a branch of expression theory and is closely related to music theory and specifically musicality. While musicality deals with finding a particular matching pair of dance and music that fit each other in various respects, dance theory is a broad term encompassing the origins, styles, genre, footwork, artistic expression, etc. of dance.

Three broad categories of dance theory, as you may find them described in universities or dance institutes, are philosophy (concerning the aesthetic meanings behind dance, or semiotics), choreology (movement analysis and description), sociology (regarding the role of dance in society and culture).

Dance theory deals with anatomical movements (such as foot-work, etc.), as well as partner interactions, and their associations to each other and to music as art. It explores the communicative, physical, mental, emotional, and artistic aspects of dance as a medium of human expression and interaction. In doing so the various nuances between the dance genres and styles are analyzed with respect to their social settings and cultures.

Michael Gerard "Mike" Tyson (born June 30, 1966) is a retired American professional boxer. Tyson is a former undisputed heavyweight champion of the world and holds the record as the youngest boxer to win the WBC, WBA and IBF heavyweight titles at 20 years, 4 months and 22 days old. Tyson won his first 19 professional bouts by knockout, with 12 of them occurring in the first round. He won the WBC title in 1986 after defeating Trevor Berbick by a TKO in the second round. In 1987, Tyson added the WBA and IBF titles after defeating James Smith and Tony Tucker. He was the first heavyweight boxer to simultaneously hold the WBA, WBC and IBF titles, and the only heavyweight to individually unify them.

In 1988, Tyson became the lineal champion when he knocked out Michael Spinks in the first 91 seconds of the fight. Tyson successfully defended the world heavyweight championship nine times, including victories over Larry Holmes and Frank Bruno. Tyson lost his titles to 42-to-1 underdog James "Buster" Douglas on February 11, 1990, in Tokyo, Japan, by a knockout in round 10. Tyson continued in his quest to regain the titles, defeating Donovan Ruddock twice in 1991. Tyson was then scheduled to take on the undisputed heavyweight champion Evander Holyfield but pulled out due to injury.

In the visual arts, color theory is a body of practical guidance to color mixing and the visual impacts of specific color combination. There are also definitions (or categories) of colors based on the color wheel: primary color, secondary color and tertiary color. Although color theory principles first appeared in the writings of Leone Battista Alberti (c.1435) and the notebooks of Leonardo da Vinci (c.1490), a tradition of "colory theory" began in the 18th century, initially within a partisan controversy around Isaac Newton's theory of color (Opticks, 1704) and the nature of so-called primary colors. From there it developed as an independent artistic tradition with only superficial reference to colorimetry and vision science.

The foundations of pre-20th-century color theory were built around "pure" or ideal colors, characterized by sensory experiences rather than attributes of the physical world. This has led to a number of inaccuracies in traditional color theory principles that are not always remedied in modern formulations.^{[citation needed]}