JAPANESE PUBLIC TOILET IN TOKYO HAS WINDOWS THAT CHANGE COLOR WHEN YOU USE IT

Summary from the TLDR Design newsletter

The Tokyo Toilet is a project in Tokyo's Shibuya Ward comprising 17 unique public restrooms designed by 16 global creatives. Among these is the "Transparent Toilet" in Yoyogi Fukamachi Kokoen, designed by Shigeru Ban, which transforms from see-through to opaque when locked, ensuring privacy. While some users have noted issues with the glass becoming opaque more slowly in colder weather, this has become a must-visit spot for tourists intrigued by cutting-edge bathroom design.