Hi Robert, You're probably right, although this didn't seem to help me. In math class they would give me a 3-d shape that was represented by the 2-d tactile graphic in my book. I was told that you had to visualize the lines in the tactile drawings as though they were folds, and if you folded the page there you would make the 3-d shape. I understood the idea, but can't visualize things that complex. I can recognize a 2-d cone, and know it's supposed to be a cone, but that's about it. maybe I'm the weird one--maybe I wouldn't be able to visualize even if I were sighted. I do know one totally sighted person who says she can't visualize at all. Kellie