Conversation so far:
What was one of Paul Klee's significant works during his mature career?
Paul Klee's Ad Parnassum (1932) is considered his masterpiece and the best example of his pointillist style.
What is something significant about Paul Klee's Ad Parnassum?
Ad Parnassum is one of Paul Klee's largest, most finely worked paintings.
What are some other works from Paul Klee's mature period, besides Ad Parnassum?
Paul Klee's self-portrait Struck from the List (1933)
What can you tell me about Paul Klee's style from his mature period?
Paul Klee used heavier lines and mainly geometric forms with fewer but larger blocks of color.

Question: Besides heavier lines and geometric forms, what else makes his work from this period recognizable?
Self-contained rewrite: Besides heavier lines and geometric forms, what else makes Paul Klee's work from his mature period recognizable?