The document discusses different types of design including structural and decorative design. It also outlines principles of good design such as simplicity, proportionality, and suitability of materials. Key principles of design are then explained in more detail, including balance, rhythm, emphasis and subordination, proportion, and harmony. Balance can be formal, bisymmetric, obvious, or informal. Rhythm can be achieved through repetition, alternation, sequence, radiation, parallelism, or continuous line movement. Emphasis highlights key elements while subordination lessens stress on other elements. Proportion refers to the pleasing relationships between different artistic elements. Harmony implies a pleasant relationship among the combined elements of a whole design.