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.
|Availability||Usually ships in 24 to 48 hours|
|Grade level||5 and Up (ages 10 and up)|
|Dimensions||5 3/16 x 8 1/4|