A blue door with a coal hole cover in front of it, Lancaster, England

I’ve walked past these coal hole covers for over 20 years without realising what they were https://en.wikipedia.org/wiki/Coal_hole

To be fair, they're next to squarish covers labelled "Water" and even the roads nearby don't have coal holes

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Prismatic coal hole cover on Hope Street in Glasgow. These were were commonly used allow natural light into the otherwise pitch black cellars. Only a few of the original prisms remain in this particular example.

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