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Leo actually offered an analogy between a pump and batteries — I have no recollection of what discussion context led him to that; possibly none at all — he sometimes just comes out with random observations. So, anyway, I ran with it:

IMG_1739

Then we started doing all sorts of analogical problems of this sort:

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This one’s sort of out of control:

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Red is the solar system, blue is the (bohr) atomic model, and green is a eukaryotic cell.