In 1946, when I was still an adolescent, I went and signed my name on the other side of the sky during a fantastic 'realistico-imaginary' voyage. - Yves Klein

It was then that I remembered the colour blue, the blue of the sky in nice that was at the origin of my career as monochromist. I started work towards the end of 1956 and in 1957 I had an exhibition in Milan which consisted entirely of what I dared to call my 'Epoque bleue'.

The glaring obviousness of my paternity of monochromy in the twentieth century is such that even if I myself were to fight hard against that fact I should probably never manage to rid myself of it.

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