Classic hallucinations explained as normal modes of a differential equation describing propagating excitations in the visual cortex. A couple of papers on the subject are linked here.
Given that my personal cosmology doesn't include any supernatural features, I always assumed that Deadheads, rave kids, and migraine sufferers were detecting features of their own consciousness. I never expected to see
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da(x,φ,t)/dt = -a(x,φ,t) + I(x,φ,t) + ∫ dx' dφ' f(x-x',φ-φ')a(x',φ',t)
though. To me, that's cause for so much more wonder.
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To digress a step further...
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