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In general, the crowns of dermal denticles have cusps pointing tailward, which is why a shark feels relatively smooth if stroked from head-to-tail but sandpapery coarse if stroked the other way.

www.elasmo-research.org/education/…/scales.htm

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Zorcron@piefed.zip ⁨13⁩ ⁨hours⁩ ago
It’s telling me that shark skin is “smooth from all directions and at all times”

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- moody@lemmings.world ⁨13⁩ ⁨hours⁩ ago
  Are you reading the same thing I’m reading? Literally every search result describes shark skin as dermal denticles, or sharp tooth-like scales aligned from front to back, “relatively smooth” in one direction, and sandpaper-like in the other.
  
  Apparently other animals regularly injured brushing up against them.
  
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  - SparroHawc@lemmy.zip ⁨12⁩ ⁨hours⁩ ago
    Well, I’m touching a shark right now. Rubbing it every which way. No direction is off limits. It’s smoother than the finest silks
    
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    Honytawk@feddit.nl ⁨11⁩ ⁨hours⁩ ago
    But other question, is shark wet?
    
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