A rock falls in the water. The ripples move outwardly. They continue on until interrupted, either by more ripples or the shore. Overlapping currents send even more swells in differing directions. Soon the calm surface is covered with ripples each moving in its own way, touching and creating a design of concentric, overlapping circles. They flow, and move, some having a direct effect, others never intersecting but still connected. One rock. Changes everything.