"Janusian thinking"—the capacity to conceive and utilize two or more opposite or contradictory ideas, concepts, or images simultaneously—is discussed in relation to its role in the creative process in art, literature, architecture, music, science, and mathematics. I feel that understanding the psychological factors in creativity should be of importance in the theory and everyday practice of the art of psychotherapy.
Rothenberg A. The Process of Janusian Thinking in Creativity. Arch Gen Psychiatry. 1971;24(3):195-205. doi:10.1001/archpsyc.1971.01750090001001