The human brain has an amazing ability to understand written language even when letters are jumbled within words, as long as the first and last letters are in the right place. This is because the brain does not read each letter individually but recognizes words as a whole. Optical illusions can confuse the eyes and brain by creating visual phenomena that appear to move, change shape, or be impossible through the use of patterns, perspective tricks, and other graphical illusions. Young children may not recognize intimate couples in images because they lack prior experiences to understand such scenarios.