Reality: it is an active, involuntary vasomotor response. The nervous system constricts blood vessels under the skin to form ridges—acting like tire treads to channel away water and improve grip on wet objects. Patients with severed median nerves don't wrinkle at all.

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[–] pelya@lemmy.world 12 points 4 hours ago

Future genetically enhanced super-soldiers: bulging bicepses lined with testosterone ampules, merciless eyes with sclera flooded red, and permanently wrinkled butt cheeks, for better grip of course.