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What Is Symmetry?
The notion of symmetry is actually much more general than the things that we would call symmetry if we were looking at like a classical building or a painting. It's not a symmetry in the classical sense, but it's a well-defined transformation that has an input and an output I give you some shape. And just as you can sort of study which kinds of objects are symmetrical under the operations of switching left and right, you could study what kinds of things are preserved by this kind of scrawn symmetry.