This document discusses key web design principles including unity, variety, balance, scale and proportion, rhythm, emphasis, and simplicity. Unity is achieved through different shades of blue. Variety comes from different shapes and colors. Balance is demonstrated as images and shapes are proportionally balanced. Scale and proportion are maintained even as image sizes vary. Rhythm is created by repetition of colors and shapes. Emphasis is on the main Google icon using negative space. Simplicity uses only three colors and one background image.