I would stay with my grandparents a lot since my parents were young. My mother was just out of high school and my father was traveling a great deal in the Navy. I once caught my grandfather sketching geometric shapes on the back of a church program, so when we got home I pressed him to do it again. He showed me how to construct a cube in such a way that it looked 3 dimensional. I was thrilled and would redundantly draw other things with angles and perceived dimensions!

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