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.

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 the mature period recognizable?