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|Cite as "Deck prisms". Appropedia. 2021. Retrieved 2021-10-23.|
A deck prism is inserted into the deck of a ship, providing light below. They have been used for centuries, safer than candles, oil and kerosene lamps (dangerous aboard a rocking wooden ship).
It is laid flush into the deck, and the prism shape refracts natural light, dispersing it in the space below.