These intersections are generally fine-grained and self-similar

Figure 2: Layered Sand subjected to three linear stresses, including a fixed end, a shaped base, and a movable end that is pushed in to emulate tectonic motion. Note the complex "fractal" patterns that occur at the intersection of these three forces. Photograph, of an exhibit at the Rose Planetarium of the American Museum of Natural History in New York, by the author.