In philosophy, what is visible, or manifest to the senses, but what is ultimately illusory. Appearance is usually contrasted with reality, and so the term often occurs in the schools of philosophy known as idealism and skepticism.Quote: "Appearances may be deceiving." Aesop (6th century BCE), generally credited as the author of numerous fables. Also see appropriation, ASTM International (American Society for Testing and Materials), copy, counterfeit, forgery, irony, likeness, marbling, mirror, representation, sight, simulacrum, simulation, stimulate, and verisimilitude.