There is an object, as a caltrop, having four projections radiating from one central node, with each forming an angle of 120° with any other, so that no matter how the object is placed on a relatively flat surface, three of the projections will form a supporting tripod and the fourth will point directly upward. That is a tetrapod. This pot was inspired by a tetrapod stone. Don’t you feel the artist exaggerated a bit with geometry and mathematics?