CausticⅢ s Three-dimensional caustics formed on a flat sea bot tom by light passing through seven consecutive wavy surfaces Caustics are places where things accumulate; in this case light is accumulating. We often think of focal points as places where light gathers after passing through a lens, but more generally, for "random"lenses, there are many more interesting patterns to examine Caustics are seen abundantly in the two-dimensional electron flow Transport series; there, we are looking at the flow as it moves along in two dimensions. Here, we are seeing the flow of light in three dimensions as it is interrupted by the sea bottom surface. This pattern is not possible for a true sea bottom, because the light has passed through seven consecutive surfaces, being refracted twice (Caustic I uses two such wavy surfaces to refract the light, Caustic I uses seven)Caustic II Three-dimensional caustics formed on a flat sea bottom by light passing through seven consecutive wavy surfaces. Caustics are places where things accumulate; in this case light is accumulating. We often think of focal points as places where light gathers after passing through a lens, but more generally, for "random" lenses, there are many more interesting patterns to examine. Caustics are seen abundantly in the two-dimensional electron flow Transport series; there, we are looking at the flow as it moves along in two dimensions. Here, we are seeing the flow of light in three dimensions as it is interrupted by the sea bottom surface. This pattern is not possible for a true sea bottom, because the light has passed through seven consecutive surfaces, being refracted twice. (Caustic I uses two such wavy surfaces to refract the light, Caustic II uses seven)