"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."