This popped up for me on YouTube Music, and it tickled me.

A mock up of Pink Floyd Dark Side of the Moon. But it's a pirate ship shooting into a crystal and it turning into a rain bow. The Album is called "Pirates for Sail, Dark Side of the Lagoon"
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[–] 7 points 1 day ago (2 children)
  • [–] 3 points 1 day ago

    A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below.

    For centuries, sailing ships used deck prisms to provide a safe source of natural sunlight to illuminate areas below decks. Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps—all dangerous aboard a wooden ship. The deck prism laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a fire hazard. It required just a 4 inch opening.

    TIL!

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