Conversation so far:
What was one of Klee's significant works during Paul Klee's mature career?
His Ad Parnassum (1932) is considered his masterpiece and the best example of his pointillist style.
What is somethings significant about Ad Parnassum?
the best example of his pointillist style; it is also one of his largest, most finely worked paintings.
What are some other works from his mature period?
CANNOTANSWER.
What can you tell me about his style from this period?
He used heavier lines and mainly geometric forms with fewer but larger blocks of color.
Besides heavier lines and geometric forms, what else makes his work from this period recognizable?
His varied color palettes, some with bright colors and others sober.

Question: Was there anyone he was working with or influenced by during this period?
Self-contained rewrite: Was there anyone Paul Klee was working with or influenced by during the mature period?