You're referring to 

> 
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These filters add up relative to each other, but not relative to space/absolute orientation. Thus polarized is not a Space Dimension thingy
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Elaborate what you mean, please :P
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I remember losing 10 points on a physics final exam for giving in to my imperfect 3D based intuition.
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I do and luckily I had three filters at hand to verify it immediately.
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Reading this tweet. Though I've not fully realized it, really.
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