Retinal Rulers
"The moment I close my eyes, there appear on the retina strange geometrical figures and designs, together with vague lights and even more sinister shapes beyond, as of great creatures past the conception of mankind - and the most frightening thing about them is that they are creatures of intelligence - immeasurably alien." - H.P. Lovecraft, The Shadow out of Space, from The Watchers out of Time, p. 108, pub. A.D. 1974
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Buzz
Normal brain function, it’s never at rest. Background noise combined with the subconsious gives some sort of order to visual interpretation.