It was in 1947 that the idea of a conscious monochrome vision came to me.. .Pure, existential space was regularly winking at me, each time in a more … - Yves Klein

Every possible buyer of an immaterial pictorial sensitivity zone must realize that the fact that he accepts a receipt for the price which he has payed takes away all authentic immaterial value from the work, although it is in his possession. In order that the fundamental immaterial value of the zone belong to him and become a part of him, he must solemnly burn his receipt, after his first and last name, his address and the date of the purchase have been written on the stub of the receipt book.

I remain detached and distant, but it is under my eyes and my orders that the work of art must create itself [Klein directed on 9 March 1960 for the first time nude models who were painting the walls with their moving naked bodies, he called this "Anthropometry"]. Then, when the creation starts, I stand there, present at the ceremony, immaculate, calm, relaxed, perfectly aware of what is going on and ready to welcome the work of art that is coming into existence in the tangible world.. .Hours of preparation for something that is executed, with extreme precision, in a few minutes. Just as with a judo throw.

A bill for 20 grams of Pure Gold, for one painted area of sensibilized immaterial. [about 1958, text on a bill for selling 'air']