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I hope that picture is some kind of toilet showroom and not a public toilet.
Is actually the Trial of the Toilets.
You have to use them all in sequence without your legs going numb or leaving to eat food.
Normally I would assume this is 100% sarcasm/a joke. But we are talking about Japan so I am only 90% sure it is a sarcasm/a joke.
If it was real, the walls would be glass and there would be spectators.