What makes this book of "spot the differences" puzzles so unique? Simply put: the quality of the photographs. Every one of the pictures comes from the acclaimed George Eastman House archive, with some dating back to the 1800s. So they make stunning art as well as absorbing brainteasers. In every case, you'll get two versions of the picture side by side; they'll look almost alike, but one is slightly different from the other. It's up to you to search...