• Scrof@sopuli.xyz
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    1 year ago

    Maybe they’re deep because of water erosion from rains over a thousand years, those bricks look pretty polished.

    • Zaphod
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      1 year ago

      I don’t think the bricks are that old. Maybe a few hundred years or so

      • CitizenKong@lemmy.world
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        1 year ago

        Also, wouldn’t water erosion make them less deep not more, due to generally smoothing the stone?

        • HonoraryMancunian@lemmy.world
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          1 year ago

          Maybe water pools in them long after it dries out on the surrounding brick, but whether still water still erodes stone I don’t know.