Children around age 3 improve in that ability to perceive patterns and discriminate various to perceive patterns and discriminate various forms. Gradually children begin to recognize and then repeat and design visual patterns. Throughout preschool, children show increasing interest in producing designs and patterns in art, puzzles, constructions, and letters and words. However, children are farsighted and have trouble switching focus between close and distant targets; they are still developing their coordination of binocular vision (the ability of the eyes to work together), which necessitates the use of large print. Also, children this age do not have great depth perception, which means they tend to run into things and other. Children may make letter reversals (e.g., confusing the letters q and p or d and b), but this is not a perceptual problem. Rather, it is a natural confusion based on previous experience; unlike symbols such as letters, objects in the physical world have same function and name regardless of their directional orientation (e.g., a block is still a block whether facing left or right).