• 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'.

    "Yves Klein, 1928 - 1962, Selected Writings". ed. J & J, the Tate Gallery, London 1974, p. 31, 1957.