Deck prism
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A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below.
Group of original deck prisms
Pavement light
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Pavement lights, vault lights, floor lights, or sidewalk prisms are flat-topped walk-on skylights, usually set into pavement or floors to let sunlight into the space below. They often use anidolic lig
Deck prism
…plain-glass panels. Deadlights were commonplace for lighting underground vaults in the 19th century, in which application they were also called "pavement lights" (UK) or "vault lights" (US). Prism lighting…
Sidewalk prisms from above, with lights shining up from inside the hollow sidewalk. The purple shade has developed over a century. These are multi prisms; the ridges can be seen running vertically (see § Transparent elements).
A bathroom lit by vault lights
The outside, showing the same vault lights from above (dark rectangles)
Armoured glass in concrete