[Anin]

In 1986 Bernado Huberman (a physicist) used a non-linear model to describe erratic eye movements.  He focused on erratic eye movements found in schizophrenia, but it was also noted that they were found in the healthy relatives of patients with schizophrenia and people with many other neurological conditions.

Travelling (non linear/chaotic) waves (resembling Beluzov-Zhabotinsky reactions) have since been found throughout nature, including ones that can be perceived by the human eye and may have associations with eye movements (specifically microsaccades).  See http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3935396/

Such waves are perceived as phosphenes (which are common to psychosis, but also found in relation to a wide range of other conditions and altered states including meditation, sensory deprivation, psychedelic drug use, and childhood).   

It would be interesting to get a physicists view of what descriptions of phosphenes might represent in terms of non linear processes.

Klüver (1926) reported that the mescaline-induced phosphene imagery could be observed with the eyes either closed or open and that with the eyes open it was impossible to look at a blank wall without seeing it as being covered with various forms (Siegal, 1977:132). He defined four main types of constantly occurring hallucinations:

   grating, lattice, fretwork, filigree, honeycomb and chessboard;
   cobwebs;
   tunnel, funnel, alley, cone and vessel; and
   spirals.

The idea that phosphenes tell us a great deal about the nature of our own consciousness is further explored in https://prezi.com/rzmvvqrcuxmn/non-linear-consciousness/

[RD]

It would be interesting to get a physicists view of what descriptions of phosphenes might represent in terms of non linear processes ...

... lattice, fretwork, filigree ... 

... honeycomb and chessboard; cobwebs;
   tunnel, funnel, alley, cone and vessel; and
   spirals. 

Can appear in computer fractals ...  http://0encrypted0.deviantart.com/art/MB3D-0781-hd-409242367

Or video feedback ...

[ give it a few minutes ]

[ see ... http://en.wikipedia.org/wiki/Pattern_formation ]