"Beyond the constructive elements of the picture, I studied the tonalities of nature by adding layer upon layer of diluted black watercolour paint. Each layer must dry well. In this way a mathematically correct scale of light and dark values is the result. Squinting facilitates our perception of this phenomenon in nature."

“Graphic work as the expressive movement of the hand holding the recording pencil.. ..is so fundamentally different from dealing with tone and color that one can use this technique quite well in the dark, even in the blackest night. On the other hand, tone presupposes some light, and color presupposes a great deal of light.”

“My etchings have.. ..the mistake of being processed as images and to have at the same time the meaning of epigrams. It is the union of pure painting with pure graphics.. .From now onwards my task will be the division of art and graphics, and the full development of both fields. The pure art has already turned to impressionism and the graphics is going to do it.”

“Paul Klee – Swissinfo web special”

“..I thought I had come into the clear in art when for the first time I was able to apply an abstract style to nature.”

“It is interesting to observe how real the object remains, in spite of all abstractions.”

“His pathos is alien to me, especially in my current phase, but he is certainly a genius. Pathetic to the point of being pathological, this endangered man can endanger one who does not see through him. Here a brain is consumed by the fire of a star. It frees itself in its work just before the catastrophe. Deepest tragedy takes place here, real tragedy, natural tragedy, exemplary tragedy. Permit me to be terrified.”