Hidden Picture Puzzles

They are right before your eyes, but your brain can be tricked into seeing something entirely different, or not seeing it altogether. They hide secrets in plain sight. Here are 135 of the most interesting and challenging optical illusions from one of the masters of the art. Start easy and go up the ladder of difficulty to test your powers of visual perception. All the answers are there, as well as the explanations of why and how things can be seen.