The brainwave frequencies are mapped to colours that tint the video as I capture my EEG readings, by coincidence they look like 'aura' images or images of Chakras ('wheel-like vortices which, according to traditional Indian medicine, are believed to exist in the surface of the 'etheric double' of man' (wikipoodia where else). I used the crude background subtraction and transparency effect I wrote the other day in Processing.
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