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HAHAH thanks GC. That's what I thought. Damn that ghostly illumination.
Actually someone explained it elsewhere -- it's the scrim effect basically, where there are two pictures sandwiched close to each other. The top picture has the heads, and the bottom picture does not. So there are LED lights embedded in each portrait (to illuminate the back portrait). As the LEDs get brighter, the spotlight shining on the portrait grows equally dimmer, giving the illusion that the head disappears.
However, if the lighting isn't correct, it does what it's doing now, which is to say, each time the picture changes it goes from DIM (when the LEDs are on) to BRIGHT (when the spotlight is illuminating the front picture).
So like when one takes a picture with flash, the head will always be there since the front part of the picture is being illuminated.
Pretty cool. But they still need to fix the lighting.
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And they say back then our universe
Was a coal black egg
Until the god inside
Burst out and from its shattered shell
He made what became the world we know
~ Bjork (Cosmogony)
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