The document outlines key design principles including balance, proportion, perspective, emphasis, movement, pattern, rhythm, variety, harmony, and unity. Balance refers to a psychological sense of equilibrium. Perspective creates the illusion of depth on a flat surface through arrangement of objects. Pattern exists both in nature and designed objects, following a finite number of structural patterns. Rhythm allows designs to develop consistency through repetition, like stairs or streets. Variety combines visual elements to increase interest, while unity gives a sense of oneness to help all elements function together.