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Loved the gut example.
Thanks. I got the idea from Stephen Hawking's A Brief History of Time. I think Hawking was saying that anthropic reasoning makes it unsurprising that we would observe three spatial dimensions. If there were only two spatial dimensions, complex organisms couldn't evolve, because e.g. two-ended digested tracks don't work. And if there were four or more spatial dimensions, the force of gravity would weaken too much with distance to hold stars together, or something like that.
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