Anyone remember Bar 89 on Mercer Street? Now shuttered, the former SoHo hotspot featured bathrooms that caused a buzz: The walls to each individual loo were transparent, allowing you to see everything inside, but once you shut the door and locked it, they turned an opaque shade of white.
That technology has existed at least since the ‘90s, but now architectural glass supplier Nana Wall has figured out how to do it framelessly. Check out their recently unveiled WhiteOUT system, which can alternate between clear and opaque and can also be used as a projection screen: