“The immaterial pictorial sensitivity zones of Yves KLEIN, the Monochrome, are relinquished against a certain weight of fine gold. Seven series of these pictural immaterial zones all numbered exist already; for each zone relinquished a receipt is given. This receipt indicates the exact weight of pure gold which is the material value correspond to the immaterial acquired. The zones are transferable by their owner. (See rules on each receipt.)”

“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.”

“I am for joining a free trade zone. The European Union is not such zone, but a zone of raging bureaucracy which stears every hectolitre of wine, and every tone of beef.”

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

“It's good to be out of your comfort zone. Just don't step out of your gift zone.”

“He who, from zone to zone,
Guides through the boundless sky thy certain flight,
In the long way that I must tread alone,
Will lead my steps aright.”

“The last time I looked at September 11th, an American street was a war zone. There was a street in Virginia that was a war zone.”

“Mark how my fame rings out from zone to zone:
A thousand critics shouting: "He's unknown!"”

“Comfort zones, after all, are the enemy of growth.”

“Whenever there is discussion, I make it clear that I do not want any grey zones, just black and white.*
Grey zones do not interest me at all.”