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 one feels how Balzac was in a hurry to finish on time. Under the pressure of his creditors, he worked himself to the point of exhaustion. As composer and librettist in one, Khanon created a complete spectacle, a compressed version, a sort of extract of the formal ballet language. His aim was to stage not only a ballet but a "ballet about ballet." "The Shagreen Bone" was defined by the author as a rearguard ballet. This is a reference to the past, while keeping the odor of the present. A question that often arises is how has it happened that