This document summarizes visual design principles that teachers need to know when designing materials for L2 learners. It discusses how typefaces, line length and spacing, white space, lines and shapes, and graphics can affect learner motivation, comprehension, and recall. The document presents theories from research on each principle and provides guidelines for applying them, such as using serif typefaces, limiting line length, leaving white space, and only including graphics that facilitate instruction. The overall message is that visual design significantly impacts L2 learners' reading experience.