I made the flags and targets to open men's eyes.. ..[they] were both things - which are seen and not looked at - examined. - Jasper Johns

An invisible drawing made in the air. Make a drawing behind your back. Make a stolen painting.

..I don’t see any point in simply stating something that is easily available. But then that may just be my own psychology, a kind of negative position. It seems to me that if you avoid everything you can avoid, then you do what you can't avoid doing, and you do what is helpless, and unavoidable. That seems to me more interesting than any other position at this moment – for me anyway.

Marcel Duchamp, one of this century's pioneers, moved his work through the retinal boundaries which had been established with Impressionism into a field where language, thought and vision act upon one another. There it changed form through a complex interplay of new mental and physical materials, heralding many of the technical, mental and visual details to be found in more recent art.. .He declared that he wanted to kill art ('for myself') but his persistent attempts to destroy frames of reference altered our thinking, established new units of thought, a "new thought for that object".