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Different gamers have repeatedly reported perceiving things ”levitating”, ”moving” or ”melting” when they look away from the screen (to a stationary point) while or after playing mainly music/dance games such as Guitar Hero or Rock Band.
These experiences are explained by visual motion after-effects (MAE) (waterfall effects) that occur due to the adaptation of the movement of arrows or frets in the game. The visual effects tend to disappear shortly after; although some gamers said that the effects last longer and occur recurrently.
By watching this video you may experience a spiral after-effect.