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Re:Why Tokyo’s New Transparent Public Restrooms Are a Stroke... by renewiltord on Monday August 17, 2020 @08:24PM (#24193940)
This is explained in the text between the headline and the first line.

The text reads: "Pritker Prize-winning architect Shigeru Ban's transparent public toilets turn opaque when in use."

The technology used is probably something like https://www.smartglassinternational.com/electric-switchable-... which is opaque when unpowered and transparent when powered.

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