They are sheets of acetate with grid patterns. You line up you art work and where the "light source" would be in the picture and it shows you where shadows would be. It is difficult to explain, I've yet to try them but find them intriguing.
__________________ Outside of a dog, a book is man's best friend.
Inside of a dog it's too dark to read.
Last edited by craftyteaspoon; 03-16-2011 at 06:38 PM..
Reason: Fix typo
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