In art, appropriation is the use of pre-existing objects or images with little or no transformation applied to them. The use of appropriation has played a significant role in the history of the arts. In the visual arts, "to appropriate" means to properly adopt, borrow, recycle or sample aspects of human-made visual culture. Notable in this respect are the readymades of Marcel Duchamp.

A found object, or found art, is art created from undisguised, but often modified, items or products that are not normally considered materials from which art is made, often because they already have a non-art function. Pablo Picasso first publicly utilized the idea when he pasted a printed image of chair caning onto his painting titled Still Life with Chair Caning (1912). Marcel Duchamp is thought to have perfected the concept several years later when he made a series of ready-mades, consisting of completely unaltered everyday objects selected by Duchamp and designated as art. The most famous example is Fountain (1917), a standard urinal purchased from a hardware store and displayed on a pedestal, resting on its back. In its strictest sense the term "ready-made" is applied exclusively to works produced by Marcel Duchamp, who borrowed the term from the clothing industry while living in New York, and especially to works dating from 1913 to 1921.