Optical illusions are fun visual tricks that confuse and surprise the brain. Inquisitive kids will discover the secrets behind the world of optical illusions in this exciting new book. Step-by-step instructions for 50 easy-to-do experiments include liquid illusions, mirrors, kaleidoscopes, and 3-D images. By using common household items with the materials included in the book, kids will be off exploring the fascinating world of optical illusions in no time. Seeing is believing!.