Conceptual art
Precursors

The French artist Marcel Duchamp paved the way for the conceptualists, providing them with examples of prototypically conceptual works — the readymades, for instance. The most famous of Duchamp's readymades was Fountain (1917), a standard urinal-basin signed by the artist with the pseudonym "R.Mutt", and submitted for inclusion in the annual, un-juried exhibition of the Society of Independent Artists in New York (which rejected it). The artistic tradition does not see a commonplace object (such as a urinal) as art because it is not made by an artist or with any intention of being art, nor is it unique or hand-crafted. Duchamp's relevance and theoretical importance for future "conceptualists" was later acknowledged by US artist Joseph Kosuth in his 1969 essay, Art after Philosophy, when he wrote: "All art (after Duchamp) is conceptual (in nature) because art only exists conceptually".

In 1956 the founder of Lettrism, Isidore Isou, developed the notion of a work of art which, by its very nature, could never be created in reality, but which could nevertheless provide aesthetic rewards by being contemplated intellectually. This concept, also called Art esthapériste (or "infinite-aesthetics"), derived from the infinitesimals of Gottfried Wilhelm Leibniz – quantities which could not actually exist except conceptually. The current incarnation (As of 2013) of the Isouian movement, Excoördism, self-defines as the art of the infinitely large and the infinitely small.
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