Excerpt from Heidi Webber on her collaboration with Le Corbusier

-Already in 1950 a few lithographs had been printed by the renowned printer Fernand Mourlot in Paris but they could only be sold with great difficulty.

The working methods of Le Corbusier fascinated me time after time. Some of the lithographs were originally created in black and white. When I saw them I remarked that for me something seemed to be missing. Yes, I would like to see some color. He then walked away, and I asked myself how he would do it. He came back with a few pieces of coloured paper and tore them into different sizes. After having checked the linear drawing, he slid the scrap of paper with his thumb until it found its place--with certainty and as if on its own.