http://www.artcyclopedia.com/artists/klee_paul.html
_ Paul Klee: A collection of 277 works
https://youtu.be/gJgyY9jF_zI
_ Who Was Paul Klee?
https://youtu.be/Nq9oBYgkxaw
_ Paul Klee: Making Visible. Retrospective at Tate Modern, London
https://youtu.be/ajbh34cKt30
