The Pulfrich effect (named after Carl Pulfrich) is a well described visual stereoillusion observed when a swinging pendulum bob is viewed through a neutral density filter in front of one eye. Although the bob is moving in a frontal plane, the path seems elliptical. The effect arises from the fact that dimming a stimulus with a neutral density filter slows signal conduction velocity between the eye and the cortex. The visual cortex interprets this as a false depth or disparity cue as the object appears in a different location in the two eyes.
We can use this phenomena in film to create a 3D stereoscopic illusion.
In order to experience the stereo illusion, hold an ordinary grey filter for your left eye only while playing the music video below.
Fata Morgana Planetaria for Phantom Frank, 2006
We can use this phenomena in film to create a 3D stereoscopic illusion.
In order to experience the stereo illusion, hold an ordinary grey filter for your left eye only while playing the music video below.
Fata Morgana Planetaria for Phantom Frank, 2006