As others have shown, it's not that rare a topic, you just have to know how to search for it.
As an engineer I've always found the Gilbert cell to be a thing of beauty, even though its usual schematic drawing isn't quite symmetrical. But its function has a multiway symmetry that you don't see in many things. OTOH, you need to know how the circuit works to know what I'm talking about.
I think others gave lots of examples, but the art in them were peripheral (unrelated) to the electronic functions.
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