The document discusses key art principles of design including proportion, balance, rhythm, emphasis, and harmony. Proportion refers to the relationship between parts of an artwork. Balance can be formal/symmetrical, informal/asymmetrical, or radial. Rhythm in art can be achieved through repetition, progression of size, continuous line movement, radiation, or gradation. Emphasis highlights important elements, while harmony creates a pleasing unity through line, shape, size, texture, or ideas. These principles are fundamental to organizing visual elements in art and design works.