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re common strategies for visual beauty, I think there's two main forces at work: 1. clean lines and smooth surfaces are strong signs of "can maintain homeostasis even under adverse conditions", which makes them useful as costly signal (plumage) or hard to counterfeit (flowers)
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and it may or may not be a coincidence that flowers look like form constants fun implication: other brain types (non-neural) will find other things cheap to verify and therefore beautiful; other modalities (smell, touch) will have different patterns
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(this answers why deep-sea creatures are ugly: they don't really rely on sight. for all I know, the water flowing over their bodies may make really beautiful sounds if you're an abyss dweller)
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