this post was submitted on 16 Sep 2025
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The stones having to come from the island messes up my thoughts on this but you could have “natural” erosion of the rock in a circle if you made a synthetic riverbed that flowed water through very quickly, while dumping sand in. Like a weirder rock tumbler. Would also take a very long time to get appropriate rocks and I’m not sure how you keep them from going into spheres, but anyway.