Model of An Artificial Reef.Drie models of art cliffs. Seen from top to the rear corners with sharp points are in the corners. In side view, the turned pyramids with anchor chains seem to be at the point below. The lower part of the one is an inverted pyramid with a square base, closed with shelves (c); At the second, the same portion is a pyramid with an octagonal base, closed with shelves, with an anchor on the chain and the radial beams are supported by knees (B); The third has left open and also has knees to support the radial beams. A standard in the middle connects all structural elements (A). Combined description