This document discusses principles of visual literacy and design for educational purposes. It defines visual literacy as the ability to interpret and create visual messages. There are two routes to visual literacy: input strategies to decode visuals and output strategies to encode visuals. The document also discusses theories of how visuals support learning and memory, such as dual coding theory. It provides examples of different types of visuals that can be used in classrooms like diagrams, graphs and charts. Guidelines are given for effective visual design including selecting elements, establishing patterns, and arranging elements according to principles like alignment, balance and consistency.