The rule could be anything, as funny or as serious as you want. The universe will progress in a similar way that it has up until this point, unless your changed rule prevented it from doing so.

Some examples might be:

  • The invention of currency is not allowed.
  • Iron is slightly less stable.
  • The Ancient Greeks are able to cultivate Silphium, which does not go extinct now.
  • Susaga@sh.itjust.works
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    2 months ago

    Cats speak french, except in any situation where they can be recorded or transcribed, or when a french speaker can hear them. They also aren’t very good at speaking french, but it’s impossible for anyone to know that.