Okay, so maybe the example ‘ghosts’ aren’t terribly spooky, but this two-way haunted mirror is a mighty fine idea, and looks like a blast to build. it works like this: “The mirror is really a box with a two-way mirror on the front. Inside the
box are models or other renderings of ghosts. Since the inside of the box is
black, the two-way mirror reflects the room normally, but when tiny lights
hidden inside the box are illuminated, they wash out the reflection and reveal
the hidden ghosts.”
Boo!