Eye-Pleasing, Mind-Teasing 3-D Conundrums

Three dimensions turn these conundrums trickily mind-teasing, while lots of color helps make them even more eye-pleasing than ever. Here are eighty-six brain-baffling concepts both classic and tantalizingly new, inspired by the computer and graphic art. Pair off a series of coiled shapes by their length, a task made much harder by the fact that each coil is viewed from a different perspective. Play number games with a stack of dice: you'll see some of the dots, and get mathematic hints about the ones not shown to help you calculate the answer. Match some figures with their shadows. Thirteen salamanders crawl across the page in different directions: which two have the same pattern? These attractive puzzles pose a challenge you just can't refuse.