The Unconscious Mind is a concept, created in language, that was popularized in late 19th and early 20th century psychology. It is widely believed that the "unconscious" was discovered rather than invented, although tangible proof of it remains illusive. How do you prove the existence of something that by definition requires the absence of consciousness?

While it is difficult to comprehend the unconscious, consciously, evidence of it can be found especially among practitioners who have learned...