ArtLex
Art Lex: Surrealism
This Artlex website gives a detailed definition of Surrealism including its founder, influences, examples of this type of art, and its relationship to dadaism.
Van Gogh Gallery
The Van Gogh Gallery: Jean Hans Arp
Biographical summary of the life and career of Jean Hans Arp, a German-French sculptor, and painter known as a Dadaist and an abstract artist.