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Originally Posted by Ketsuban
2) I'm not sure I follow. What about gravity favours bilateral symmetry? Starfish have five legs; a triaxial alien doesn't seem that weird by comparison.
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I hadn't thought of starfish. But I was thinking of animals that walk upright. As far as I can recall, all land-based animals are bilateral (and even most mobile marine life).
Thinking about it, the aliens in 'Arrival' were similar to a jellyfish, which is multilateral?