This is an old sketch from school days that I happened to have scanned. You can see the layers of lines built up as I felt around for the shape I wanted and then started to nail down the ones that landed where I wanted them.
When I was in fourth-year architecture, I took an elective course in multidimensional geometry. (Yes, I did this on purpose. It was a great course.)
In the opening lecture, the professor stood at the front of the class and asked us whether anyone could imagine an equilateral triangle with three right angles in it. Nobody could – it breaks all the rules about what triangles are. He then threw a transparency on the overhead (this was 1995 – ask your parents if you have no idea what an overhead was) that contained an image of the earth – a line was drawn along one…
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WindySilver 