The document discusses various principles of design including proportion, scale, balance, rhythm, symmetry, hierarchy and axis. It provides details on proportion in materials, structures and manufactured elements. It also covers theories and systems of proportion like the golden section, classical orders, Renaissance theories, Modulor and anthropometry. Balance is described as visual, symmetrical, asymmetrical and radial. Rhythm is the repetition of elements in space and time. Axis is defined as a line between two points that elements can be arranged around. Symmetry is the balanced distribution of equivalent forms on opposite sides of a line.