Conversation so far:
Can you tell me about Paul Klee and his mature career?
In 1919, Klee applied for a teaching post at the Academy of Art in Stuttgart.
Did Paul Klee get the position of teching post at Stuttgart?
This attempt failed but he had a major success in securing a three-year contract (with a minimum annual income) with dealer Hans Goltz
Did Paul Klee keep the contract with Hans Goltz?

Question: Are there any other interesting aspects about this article?
Self-contained rewrite: Are there any other interesting aspects about Paul Klee's mature career?