Despite having many revolutionary ideas, Sigmund Freud is generally known for only a smattering of his stranger concepts. Introductory psychology courses rarely mention him beyond the obligation of teaching that he devised psychotherapy, had stages of psychosexual development, and is largely discredited in modern psychology.

One of Freud’smore enduring conceptsis that of the construction of human consciousness. He theorized that the human psyche consisted of three parts: Id, Ego, and Superego...