Mist/Water projection screens

Modern theme parks use many mist / water projection screens which are able to be turned off such that there is nothing but the mechanism visible. Because they can be passed through, rides use them as a way to project in the path of moving vehicles (think Pirates of the Caribbean) and many shows use them because they can be used to project onto in one second, and then turned off to allow full view of everything else the next (Think World of Color or Fantasmic).

My request here is for a third type of screens, one that is completely contained within a small FX type box while turned off, but produces a projection above it when turned on. I don't feel like these screens need to be completely accurate (producing distortion, letting light through, cutting off edges) because I think that that is probably better handled by the creator of the media rather then the game engine. These screens would allow a much wider variety of shows/ride effects that I could see myself using, and I believe would lead to many exciting and cool ideas within the game.
 
Almost like a holograph projector?
I was thinking that would be a cool way of having ghosts/apparitions in a haunted house.
 
That could work like a bilboard with some effects applied to it (transparence, mist). Could be very cool, neat idea!
 
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