The document discusses several key principles of design including rhythm, unity, balance, proportion, emphasis, contrast, movement, dominance, repetition, and gradation. Rhythm refers to the repetition of design elements with defined intervals. Unity describes the relationship between parts and the whole. Balance can be symmetrical or asymmetrical and creates a feeling of visual equality. Proportion compares the size of parts to the whole. Emphasis draws initial attention through contrast, value, color, or placement. Contrast and gradation are used to create visual interest and guide the eye through a composition.