Quotes from Joseph Kosuth

All art (after Duchamp) is conceptual (in nature) because art only exists conceptually.

That 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.

The 'value' of particular artists after Duchamp can be weighed according to how much they questioned the nature of art.

I 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.

Anything can be art. Art is the relations between relations, not the relations between objects.

Change art to include yourself.