although castellón worked in virtually every media, he remains best known for his early graphic work, particularly his lithographs and etchings, media in which he became a master. his prints and drawings of the early 1930s are the first examples of surrealism created by an american; a considerable feat because castellón produced these highly original works not only before his travels abroad, but before the seminal exhibition "fantastic art, dada, surrealism" at new york's museum of modern art.