Wouldn't it be possible to grind two polarized lenses and glue them together at a particular angle?
You'd get a moire pattern.
You would only get that in cars, and only because of the way the windshields are polarized. I think It's a cool looking effect, actually. I saw a while back some electronic blinds that used LCD tech to turn darker. One plate was polarized at 90 and the lcd was polarized at 180. By applying a weak electrical current to the LCD, the entire window just got darker. It even included a remote control.
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