Every perception of colour is an illusion.. ..we do not see colours as they really are. In our perception they alter one another. - Josef Albers

For me, abstraction is real, probably more real than nature. I'll go further and say that abstraction is nearer my heart. I prefer to see with closed eyes.

There science is dealing with physical facts, in art we are dealing with psychic effects. With this I come to my first statement: 'The source of art – that is, where it comes from – is the discrepancy between physical fact and psychic effect'. That's what I'm talking about. When I want to speak about why I am doing the same thing now, which is squares, for – how long? – 19 years. Because there is no final solution in any visual formulation. Although this may be just a belief on my part, I have some assurances that that is not the most stupid thing to do, through Cezanne whom I consider as one of the greatest painters. From Cézanne we have, so the historians tell us – 250 paintings of Mont St. Victoire. But we know that Cézanne has left in the fields often more than he took home because he was disappointed with his work. So we may conclude he did many more than 250 of the same problem.

This is what has Gropius the director made the Bauhaus famous. Not its lamps or its furniture. They are all out of fashion already. But the way of approaching formal problems or material as such, that has made it famous. And the emphasis on material, especially its capacity is my contribution. That was never cleared between us teachers. Kandinsky did what he thought should be done. Klee developed an absolutely different method. Schlemmer developed absolutely something else. Klee was my so-called form master. In the workshops there they had a crafts master and a form master. The crafts master had to direct the practical work, the mechanics of the workshop. And the form master had to develop the, formal qualities. Klee was my form master in the glass workshop. He came to me and never criticized anything. He talked about something else. Never asked about any form problem with the windows I was working on. Never a word. He was too respectful. He was the nicest master I could ask for. He talked about exhibitions. He thought I should exhibit. That's another story. We had a good relationship because we never dealt with the same problems. He didn’t attack our problems. He never brought up a problem.