This document discusses the graphic design principles of repetition and contrast. It defines repetition as consistently using certain design elements throughout a piece to guide the reader and add unity. Contrast is created by making two elements visually different, such as with size, color or shape, to make things stand out and add organization and interest. The document provides examples and tips for effectively applying these principles, such as repeating a bold font or color scheme, and using strong differences in size or style to create contrast without overdoing repetition.