Disdude 21 Visual Perception
Looking out of the retina images or bytes of information in the visual field are observed by (give or take) 125 million photoreceptors. More on those guys another time the optic nerve being focus (Puntastic) this round it transmits all that visual data to brain. The optic nerve is a bundle of fibers which attaches to brain at LGN or Lateral Geniculate Nucleus.
LGN drops that little package of coding which resembles shapes like tunnels and funnels, spirals, lattices, and cobwebs of to visual processing cortex. These basic geometric shapes are put together with specific algorithms to form the actual world we see. Good to note without strong details other regions are accessing past memories/feelings, also present concerns while addressing future consequences to actions we may take.
Those basic geometric shapes of data in which are brain take in via optic nerve are the same seen during certain types of hallucinations. A scientist named Heinrich Klüver made the connection the shapes are a map or schematic of elementary visual processing areas of brain. Reason the majority of human eyes react strongly to those shapes like the one below which look like movement, but are completely still.