This document discusses different theories of what art is through examples from art history. It explores the ideas that art is representation, imitation or depiction of reality; art is about form, composition, color and other design elements; and art is expression of emotions. It also discusses the view that anything can potentially be considered art. Examples discussed include cave paintings, classical sculptures, Renaissance art, modern photography and contemporary installation and performance art. The document aims to illustrate different philosophical perspectives on the purpose and nature of art through visual examples.