Fish scale the surface, interacting only with the riblet tips, not causing any high-veloctiy flow in the valleys. Since this high velocity flow now only interacts with the riblet-tip, which is a very small surface area, the momentum transfer which causes drag is now much lower than before, thereby effectively reducing drag. Also, this reduces the cross-stream velocity fluctuations, which aids in momentum transfer too. The rough, sandpaper-like texture of shark and ray skin, coupled with its toughness, has led it to be valued as a source of rawhide leather, called shagreen. One of the many historical applications of shark shagreen was
Eth's Skin Eth's Skin Eth's Skin is a webcomic written and drawn by Sfé R. Monster since 2014. Following Eth, a non-binary fisherman who lives in a magical version of British Columbia, "Eth's Skin" tells a story in which the protagonist accidentally picks up the skin of a selkie, which triggers an adventure. Inking on the webcomic is done by Kory Bing. The story of "Eth's Skin" takes place in a magical version of British Columbia populated by mythological creatures such as pixies and selkies. In this constructed world, humans live in harmony with merfolk and aquatic mammals, and LGBT subjects are