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.
Was there anyone he was working with or influenced by during this period?
he was encouraged by a visit from Kandinsky and Picasso.
How did Kandinsky and Picasso encourage him?
However, in 1933, Klee began experiencing the symptoms of what was diagnosed as scleroderma after his death.

Question: What were some of these symptoms that he was experiencing?
Self-contained rewrite: What were some of the symptoms of scleroderma that Paul Klee was experiencing?