Surrealism was an art movement in the 1920s. Surrealist paintings often feature surprises or unusual juxtapositions and were intended to break through the barriers of conventional arts and dive into the subconscious. The resulting artwork was often odd, but said to show true human thought.
Salvador Dali, The Persistence of Memory
Giorgio de Chirico, Premonitory Portrait of Guillaume Apollinaire
Yves Tanguy, Indefinite Divisibility