> A natural image is formed when a collection of objects is illuminated by incoming light, and the resulting image is projected onto the retina. But that's sor

> A natural image is formed when a collection of objects is illuminated by incoming light, and the resulting image is projected onto the retina. But that's sort of the point no? The incoming information is not an unstructured white noise of photons striking our retina. There is a sort of structure to the information that can be modelled. One such model of this structured information is as a "grammar tree" (really just a tree, we're coders here.) The example in the article is that the arm occludes the teepee, which occludes the background trees. Any visual system needs to break this hierarchy down.