4 ms·

We’ve not forgotten it - we’ve just chosen to optimize for a different point in the (longevity, cost, time, material) space.

• mitthrowaway2 4y ago
  What makes you think that it hasn't been forgotten?
  • rawling 4y ago
    Well, Wikipedia lists an example built in 1958. https://en.wikipedia.org/wiki/Fan_vault https://en.wikipedia.org/wiki/Fan_vault
    • mitthrowaway2 4y ago
      That's a retirement-age ago. Wikipedia also says that particular vault is made of concrete and steel, while being faced with stone.