Thought it was some Illuminati shit or at least a functional desk ornament I can drop on my head when the need arises. Turns out it's a deck prism. They used to cut holes in ship decks, slip these badboys in, and it diffuses light from the Sun for safe lighting around flammable cargo down in the hold. Reminds me of that guy who used the same concept for poor communities with water bottles in the ceilings of their sheet metal shacks. Hmmm, wonder where he got the idea from, hmmm. Anyhow, neat find.
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https://en.wikipedia.org/wiki/Pavement_light
they used to do something similar in sidewalks
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No illuminated sidewalks. We really are living in the dark ages
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