A rich assortment of visual mind-bogglers, including "impossible objects" — constructions that look fine on paper but can't possibly exist in reality — as well as pulsating patterns, vanishing spots, pictures that suddenly change into other configurations as you're looking at them, and much more. 60 black-and-white illustrations.

Fool your brain with mind-boggling illusions, then get hands-on and make your own to wow your friends! Learn all about the science behind these wacky phenomena, from moving liquid on a page, to shapes that disappear in front of your eyes with this clever guide. The brain is an amazing thing, but it doesn't always get things right when it comes to sight. This book is here to explain why, with astounding images, baffling puzzles, and simple reveals which show the reader how each trick works. Covering a range of optical topics, from shapes and movement, to light and reflection, this cool manual contains templates at the back which reveal answers and help you to create your own astounding illusions.

Contains color and black-and-white illustrations of over three hundred optical illusions, each with brief, explanatory text.

More than 135 puzzles, illusions, and activities in this four-color book, with answer key in the back. Features optical illusions, visual puzzles to challenge logic and spatial reasoning, and color-by-number illusions for readers to complete. Convenient spiral binding with colorful, appealing design throughout.

This book is crammed with puzzles designed to stimulate each of your brain's cognitive functions, keeping it strong and fit. Many different types of puzzles are included, and each of the five levels increases the challenge of solving them. Includes three self-evaluations that allow you to assess your improvement in areas such as focus, attention, memory, and more.

A fascinating collection of 270 visual conundrums to test your perception and boost your intelligence.

Practical guide shows how to set up working models of telescopes, microscopes, photographic lenses and projecting systems; how to conduct experiments for determining accuracy, resolving power, more. 234 diagrams.