This appears to be related to the https://en.m.wikipedia.org/wiki/Pulfrich_effect https://en.m.wikipedia.org/wiki/Pulfrich_effect where darker part of the image

This appears to be related to the https://en.m.wikipedia.org/wiki/Pulfrich_effect https://en.m.wikipedia.org/wiki/Pulfrich_effect where darker part of the image are processed a bit slower by the brain and movement can give effect of depth. To Scott had a video on it https://m.youtube.com/watch?v=Q-v4LsbFc5c https://m.youtube.com/watch?v=Q-v4LsbFc5c