Frosted glass can often be restored to transparency by putting a strip of clear tape over the rough side. And I agree that your privacy-glass camera would be a

Frosted glass can often be restored to transparency by putting a strip of clear tape over the rough side. And I agree that your privacy-glass camera would be a fun project. The kicker is that it may even be able to reconstruct portions of the 3-d scene behind the window that would not have been visible through a clear window. I recall seeing a project to create a camera that can see around corners by analyzing the diffuse reflections on surfaces visible to the camera. It would be almost the same principle.