You have touched them while fishing for parking meter change, digging through couch cushions, or dumping your pockets into a ceramic dish by the front door. You run your thumb along the rim of a quarter or dime, and your skin catches on a steady ring of tiny raised grooves. They feel familiar. Satisfying, even. Yet most of us never pause to ask why they exist in the first place.
Those miniature ridges are formally known as reeded edges. They are not an aesthetic flourish dreamt up by an artistic
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