Clement Greenberg talked about the ideas or possibilities of painting in his - I think -, 'After Abstract Expressionism' article, and he allows a blank canvas to be an idea for a painting. It might not be a good idea, but it's certainly valid. Yves Klein did the empty gallery. He sold 'air', and that was a conceptualized art, I guess.
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About Frank Stella
Frank Stella was a 20th-century American artist. Frank Philip Stella was an American painter, sculptor, and printmaker, noted for his work in the areas of minimalism and post-painterly abstraction. He lived and worked in New York City for much of his career before moving his studio to Rock Tavern, New York. Read more on Wikipedia →