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by araes 961 days ago
I suspect you're correct, at least partially.

My personal suspicion is that the light waves are hitting the extremely diffuse binder material and then ejecting the water light a billiard ball or a solar sail effect. It may have a resonance (vibration) with the binder structure. See below image for example of binder material.

https://upload.wikimedia.org/wikipedia/commons/d/d3/Short-pe...