Like the other books in this series, Brain Games Optical Illusions is a unique and creative way to get the mental exercise you need. The workout here is more focused as you'll be asked to draw on your powers of observation and visual reasoning skills in order to unlock the tricks behind these illusions. Optical illusions force you to think outside the box, helping to refresh your eyes to the world. Oftentimes we take for granted what we see--or see what we want to see--as our minds go on autopilot. The puzzles in this book remind us that things aren't always what they seem. Illusions are arranged by category--from tricks of perspective to perceived motion, there is no shortage of variety in this book.