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
The Shagreen Bone role. The soundtrack contained the "entr’acte" and some of his other works: "The Song about Death No.1" and "Mechanics of Thought Movement" (from the cycle "Public Songs", Op. 34). The film choreographer and scenographer was Andrey Bosov, the leader of the youth group of the Kirov Ballet. "The Shagreen Bone" is written in the genre of "tendentious classical ballet" or "ballet with comments." Paradoxically, it was Ludwig Minkus's "Don Quixote" and Eric Satie's "Parade" which served as reference for the composer. When working on the ballet libretto Khanon noticed how "hastily and carelessly this novel was written." Throughout the text