..the thinking man is no longer the center of the universe, but the universe is the center of the man [referring to collaborations between artists, i… - Yves Klein

The essential of painting is that something, that 'ethereal glue', that intermediary product which the artist secretes with all his creative being and which he has to place, to encrust, to impregnate into the pictorial stuff of the painting.

I dash out to the banks of the river [river the 'Loup', at Cagnes, France] and find myself amongst the rushes and the reeds. I grind some pigment over all this and the wind makes their slender stalks bend and appliqués them with precision and delicacy on to my canvas, which I thus offer to quivering nature: I obtain a vegetal mark. Then it starts to rain; a fine spring rain: I expose my canvas to the rain.. ..and I have the mark of the rain! – a mark of an atmospheric event.

In case the buyer wishes this act of integration of the work of art with himself to take place, Yves Klein must.. ..plus two witness, throw half of the gold received in the ocean, into a river or in some place of nature where this gold cannot be retrieved by anyone. From this moment on, the immaterial pictorial sensitivity zone belongs to the buyer absolutely and intrinsically.