You see these pieces of paper at a lot of shrines in Japan. Apparently they contain a fortune, and you make an offering to get one from a box.
If the fortune is bad you can tie it to a wall in the shrine so the bad luck remains.
Strangely if the fortune is good you can also tie it to the wall to get double luck.
I would love to try my luck. 🙂
The picture you shared is very pretty.
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