Form constant

He called these patterns "form constants" and categorized four types: lattices (including honeycombs, checkerboards, and triangles), cobwebs, tunnels, and spirals.

Other triggers include psychological stress, threshold consciousness (hypnagogia), insulin hypoglycemia, the delirium of fever, epilepsy, psychotic episodes, advanced syphilis, sensory deprivation, photostimulation, electrical stimulation, crystal gazing, migraine headaches, dizziness and a variety of drug-induced intoxications.

The diversity of conditions that provoke such patterns suggests that form constants reflect some fundamental property of visual perception.

The cultural significance of form constants, as Wees notes in Light Moving in Time is part of the history of abstract film and video.

As part of this work, form constants feature prominently as a basis for the design of psychedelic sonic and visual material.