Pulfrich Phenomena
This pendulum circles.
Through the optics, this pendulum swings in an elliptical path. With a gray filter in front of the other eye, its direction changes. Adjusting the brightness (or darkness) of the filter alters the pendulum’s path.
Spatial perception happens in the brain. It is created from the different information received by each eye. The naked eye responds faster to the same object than one looking through a dark glass. The darker the filter, the greater the delay (latency).
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