All art (after Duchamp) is conceptual (in nature) because art only exists conceptually.
Joseph KosuthI liked that the work itself was something other than simply what you saw It meant you could have an art work which was that idea of an art work, and its formal components weren't important.
Joseph KosuthForget your ideas about art. Make a shopping list of everything you like about what you've done. Include qualities that you've seen in your life, in the world, and possibly in art that you like. Take this list and make a work that satisfies all of the things on your list without caring if it looks like art.
Joseph KosuthThat celebrated marriage of science and art, photography, seemed at the time to join together how we look at the world, art, with how we were coming to know it, science.
Joseph KosuthWhen objects are presented within the context of art (and until recently objects always have been used) they are as eligible for aesthetic consideration as are any objects in the world, and an aesthetic consideration of an object existing in the realm of art means that the object's existence or functioning in an art context is irrelevant to the aesthetic judgment.
Joseph Kosuth