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One upon a night, while looking at the physics SE site, I put on, by accident, a pair of 3-d glasses. I discovered that if I turned my head around the for/backward-axis of my head, from left to the right, the contrast of the color changed from low to high.

Any suggestions or an answer(s) to this question?

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LCD monitors emit polarized light because they use polarization filtering to control the amount of light passing through each pixel.

Common 3D glasses also just are two polarizers stuck into a frame. So when you're tilting your head, you're changing the angle of the polarization of your glasses against the angle of the light from the LCD, thereby in- or decreasing the intensity of light from the display actually making it to your eyes.

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