For me it remains an open question whether [this work] pertains to the realm of mathematics or to that of art.

I came to the ... open gate of mathematics. From here, well-trodden paths lead in every direction, and since then I have often spent time there. Sometimes I think ... I have trodden all the paths ... and then I suddenly discover a new path and experience fresh delights.

I never got a pass mark in math ... Just imagine - mathematicians now use my prints to illustrate their books.

I could fill an entire second life with working on my prints.

I am always wandering around in enigmas. There are young people who constantly come to tell me: you, too, are making Op Art. I haven't the slightest idea what that is, Op Art. I've been doing this work for thirty years now.

I might be in the basement. I'll go upstairs and check. We adore chaos because we love to produce order. I don't use drugs; my dreams are frightening enough.

Are you really sure that a floor can't also be a ceiling?