I sometimes teach a topic I call Martian Math, checkout 4Dsolutions on Github. Anyway, we emphasis chirality, the concept of handedness, which our elementary school concept of “congruence” may sometimes obscure. Anyone playing Tetris knows a left facing L is no substitute for a right facing one, as no amount of rotation / translation makes one into the other. I’m just happy when I teach this course again, I’ll have your article in the links.

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