Transparent wall toilet?

「The Tokyo Toilet」Architect Shigeru Ban designed a unique public toilet in Shibuya. The toilet is made with a special glass technique - it's fully transparent from the outside, but becomes opaque when locked from the inside. This allows users to check if the toilet is clean and empty before entering, ensuring safety and privacy or its for anti-Public Sex regardless of what it is you don’t need to visit a museum for art in Japan, it's right in the public restrooms!