Uguisubari aka nightingale floors were a Japanese innovation. This super squeaky floor was an early version of an alarm. The specially constructed floors were in only a select number of castles, but they would alert guards and residents to a shinobi attempting to be sneaky.
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Check out this Wiki entry on nightingale floors Trace talked about.
Look grammar police, it’s octopuses and we don’t have to like it, BUT you are going to love learning that just like humans, octopuses do seem to have a preferred
