Constructive Alternativism.

With his theory of constructive alternativism, George Kelly [1] posited that our experiences of the world around us, including events that take place or our understanding of people, including ourselves, are open to an immense variety of interpretations. Kelly argued that no one construct is a final or definitively accurate way of grasping the world. Instead, we can always create alternative constructs to better explain or represent that which we observe. A revised construct can increase our ability to comprehend the world around us and help us feel that we can predict or control it. Therapists can use constructive alternativism to help clients who are depressed or anxious live happier lives by reconsidering the way the clients have appraised their lives. Cognitive therapy, in fact, is based to some extent on this premise.

The whole is other than the sum of the parts.

The gestalt effect is the form-generating capability of our senses, particularly with respect to the visual recognition of figures and whole forms instead of just a collection of simple lines and curves. In psychology, gestaltism is often opposed to structuralism. The phrase "The whole is greater than the sum of the parts" is often used when explaining gestalt theory, though this is a mistranslation of Kurt Koffka's [2] original phrase, "The whole is other than the sum of the parts". Gestalt theory allows for the breakup of elements from the whole situation into what it really is.

Post-Hypnotic Suggestion

James Richard Cocke (1863 – 1900), who had been blind since infancy, was an American physician, homeopath, and a pioneer hypnotherapist.

He was born in the South of the United States, and had been totally blind since he was an infant. His sight had been completely destroyed when acid was accidentally applied to his eyes when he was just three weeks old.
He was considered to be "highly educated"; and, despite his total blindness, "was able to go around the city at will", and "could play a piano with much skill":