.... Suprisingly enlightening term paper, if you make it through the rambling parts.
http://home.comcast.net/~markk2000/thurston/thesis.html (http://home.comcast.net/~markk2000/thurston/thesis.html)
Entopic forms and the seven principles of perception.
http://dspace.dial.pipex.com/town/avenu ... toptic.htm (http://dspace.dial.pipex.com/town/avenue/pd49/pockets/weird/entoptic/entop/entoptic.htm)
Altered States: The Origin of Art in Entoptic Phenomena
http://www.wynja.com/arch/entoptic.html (http://www.wynja.com/arch/entoptic.html)