This document discusses the Gestalt principles of design, which are theories about how humans perceive and organize visual elements. It describes the principles of balance, continuation, closure, figure-ground relationship, focal point, proximity, similarity, simplicity, and harmony. For each principle, it provides the theory, examples of how to apply the principle in design, and an illustrative example. The goal is to help designers understand how to structure interfaces in a way that is intuitive for users based on cognitive processes.