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This is NOT a prism!
(i.imgur.com)
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this post was submitted on 04 Aug 2023
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expectationvsreality
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Not a prism, but it could be 2 pieces of polarized glass with a sheet made of bits of cellophane in different orientations in the middle. That can turn out very pretty, this link has some videos attached to show off what it could look like.
The broken glass really stinks though.