My piece Trajectories consists of long glass rods shaped into curves and colored with transparent oil paints. They hang to represent the path your hand takes when throwing something like a javelin, a shot-put, a cricket ball, a spear. I hang them in pairs. If you want, you can think of them as the shine on the back of a leaping dolphin.
A curve is a very primeval shape.
Made of excessively tough glass, the rods can be hung in various arrangements.