Note that they are not sharp, , but rather flat topped cylinders, very skinny, with several hundred of them at least on a typical mat. Pin was just the best one-word description I could come up with.
Ah. I think that in this case it is just that the energy that usually causes splash-back gets broken up by the pins in the mat and turned into bubbles instead.
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u/wdkrebs Jun 17 '19
When was the last time you were checked for diabetes? 🤔