« Reply #4 on: October 28, 2022, 06:47:11 AM »
It's overhead stage lighting reflecting off the black keys. The angle of the light, camera and keys caused a reflection into the camera. Then the panning of the camera and/or the light caused to "sweep" along the keys.
I believe you're right, the angle of the light is the key -- somehow my brain doesn't like to process the idea of light reflecting much stronger off of a black colored material than the white version of same, though given specific angles of light and material I suppose the seemingly paranormal is possible
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