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YuntHunter t1_iu3j02l wrote

Reply to comment by itchy_008 in TIL about anti ninja floors in Japan. They were purposefully made to squeak as to alert people of intruders. by tpb01

From Nijo Castle, these weren't intentional.

"The singing sound is not actually intentional, stemming rather from the movement of nails against clumps in the floor caused by wear and tear over the years"

I was there a few years ago and remember reading this.

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