human
Write a detailed description of a tidal pool scene with a plaque and a crab.
assistant
From beneath, the surface of the water is a window of wrinkled, moving glass interspersed with foamy caps. The ebb and flow of the churning current kicks up black sand that whirls about an eroded iron plaque half-buried in the sandbar. In the refracted moonlight, a large, pale red crab, its claws held wide open, scoots quickly along the sandbar unaffected by the tide.