- Level 5 - Easy
- Level 6 - Tricky
- Level 7 - Challenging
- Level 8 - Demanding
- Level 9 - Gruelling
- Level 10 - Mind Boggling
Now You See it, Now You Don't - book
|Dimensions||9 7/8 in x 8 7/8 in x 3/4 in / 24.9 cm x 22.5 cm x 1.8 cm|
Authors: Seymour Simon
This classic book allows readers to explore dozens of visual riddles, perform amazing optical experiments, and learn how artists use optical illusions to make their work more life-like--or create original worlds. Illustrations, many in color.
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