Painting is laying layer upon layer. Without exception it is fundamental to all painted pictures even if they look as if they were done in one movement. The movement has always crossed its own track somewhere. It is easy to understand that a picture is layer upon layer when it comes to Picabia's puzzle pictures or my own material works, but it is difficult with the 'synchronos'. By the 'synchronous' I mean all those pictures where all the layers aim at the same picture, where the under-painting and following layers – glazed or not – fall on top of each other. The 'unsynchronous' are the ones where each new layer is a new picture. It is like geological strata with cracks and discordances. But each new layer, however furious, is always infected and coloured by the underlying one. Even when it is slates where the previous payer is completely removed physically, wiped off.