I could only relax when there was just one tiny white last spot left. I could see more clearly. I could grasp the shape of the picture again... The pictures are alive because of the white remnant, the almost concealment.
In 1968 I frequently would sit in a photo booth and practice self mirror images which I then documented photographically. Curious types would always open the curtains and chase me away. Today I work with a photographer.
Only the four corners of the background remained. It was terribly difficult to fix my eyes on all of them at the same time. My experience was that the most difficult thing of all in art is painting in all four corners at the same time.