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Boris comments on Decoherence as Projection - Less Wrong
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Why doesn't someone make some circular sunglasses that have two polarized disks that you can rotate with respect to each other?
I was surprised to find out that someone did, but it probably doesn't work very well since nobody seems to retail them. Possible problems could include irregularities in the polarization, like what makes the rainbows in car windows when you're wearing a single polarized lens.
The idea occurred to me several years ago, but I passed up on it, since it seemed like it would be difficult to make it with lenses that weren't circular, and those aren't really in style (or are even that effective, given the shape of the human face).
Well, it isn't quite that, but I made an analogue of it prompted by that exact same thought. Movie 3-d glasses are polarized (the two slightly different images on the screen have orthogonal polarizations, so each image only goes through one lens), so if you can sneak two or more pairs of 3-d glasses out of a movie theater, you can pop the lenses out of one pair, and tape them on the other pair (rotated so that almost all light is canceled out.) The resulting cross-polarized improvised glasses are so dark, that if you made them just right, it is possible to stare straight at the sun and see sunspots. However, this makes them quite useless for most other purposes.