The major Surrealist painters were Jean Arp, Max Ernst, André Masson, René Magritte, Yves Tanguy, Salvador Dalí, Pierre Roy, Paul Delvaux, and Joan Miró. Frida Kahlo and Pablo Picasso are sometimes included on this list but they never officially joined the Surrealist group. Each artist sought his or her own means of self-exploration. In the poetry of André Breton, Paul Éluard, Pierre Reverdy, and others, Surrealism manifested itself in a juxtaposition of words that was startling because it was determined not by logical but by psychological—that is, unconscious—thought processes.