Transparent toilets are being installed in some parks in Tokyo. The see-though loos feature a colorful, see-through "smart glass". But, when someone enters the stall and locks the door, the walls become opaque. So long as the door remains locked, no one can see in. The see-through loos can be found in the Shibuya district, and are part of the so-called Tokyo Toilet Project. It’s an initiative meant to reimagine what public restrooms can be.
Just don't forget to lock it!