this post was submitted on 06 Dec 2023
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I would guess triangle, because stick.
But if we're talking three-dimensional shapes in rigid objects, spherical stones were presumably the endgame form of many tools, before any deliberate shaping would occur. Once people really stuck with The Good Rock versus grabbing whichever nearby seemed appropriate, surely they'd just grind down any harsh edges on the grippy side, using the complex volumetric planning of rubbing the annoying part against a bigger rock.