This document outlines key principles and elements of design including harmony, proportion, balance, rhythm, emphasis, line, texture, and color. It describes harmony as unity with variety through repetition. Proportion relates size of parts to the whole. Balance can be formal/informal and symmetry/asymmetry. Rhythm creates smooth movement for the eye. Emphasis draws attention to the most important part first. Line forms the basic skeleton. Texture refers to surface appearance. Color theory is explained through primary, secondary, tertiary colors and color schemes like monochromatic, analogous, complementary, split complementary, and triad.