The document discusses key principles of design including balance, emphasis, rhythm, proportion, and harmony. It defines each principle and provides examples to illustrate how they can be applied. Balance is achieved through symmetrical or asymmetrical placement of elements and consideration of weight, size, color, and position. Emphasis draws attention to important elements through grouping, contrast, size, or position. Rhythm creates a sense of movement through repetition of shapes, sizes, lines, or other elements. Proportion relates the size of design elements to the overall space. Harmony ensures all parts of a design relate and complement each other through consistency.