Now You See It, Now You Don't: The Amazing World of Optical Illusions in Bloomington, MN

This classic book on optical illusions explores dozens of visual riddles about distance, depth, brightness, contrast, and color. Newly designed and filled with more than eighty illustrations — plus eight full-color pages of optical illusions —
Now You See It, Now You Don't
lets youngsters see for themselves why they can't always believe their eyes!