Surrealism developed between 1910-1920 as an artistic movement that explored the subconscious mind and dream imagery influenced by Freudian psychology. René Magritte was a prominent surrealist artist whose paintings featured common objects altered in scale or placed in absurd settings to raise viewers' awareness of their own thought processes. Some surrealist techniques Magritte employed included scale changes, levitation, juxtaposition of unrelated objects, dislocating objects from their usual environments, making objects transparent, and transformation.