Conversation so far:
What was Peggy Guggenheim collecting?
In 1938, Guggenheim opened modern art gallery in London featuring Jean Cocteau in its first show, and began to collect works of art, often purchasing objects from each exhibition.
Why was Peggy Guggenheim collecting art?
While visiting a foundry with Jean Arp, Peggy Guggenheim held his small bronze Head and Shell in her hand, and was moved to collect her first piece of art.

Question: What else is notable about her collection?
Self-contained rewrite: What else is notable about Peggy Guggenheim's collection besides often purchasing at least one object from each of her exhibitions at the modern art gallery in London she opened in 1938?