- Bullets should be aligned on the left side of slides for easier reading from left to right. Backgrounds, fonts, graphics and other design elements should complement the content without distracting from it. Lists should follow the "rule of four" with no more than four items to aid recall. Text and graphics should have good proximity so the audience's eye flows smoothly through the presentation. Fonts should be visually simple and consistently sized without being overly distracting. Perceptual differences like colors or fonts should be used clearly to distinguish different elements.