Seeing is believing . . . isn't it? Robert Ripley travelled the world looking for amazing facts, oddities and curiosities that seemed unbelievable, but were really true.
Why are optical illusions unbelievable? Because if you're like most people you trust your eyes and believe what you see. And you may find it hard to believe that something that looks so obvious is not quite what you think it is. Here is the ultimate activity book jam-packed with over 100 optical illusions.
