Hi-Tech?

Casper Cloaking Technology Films – Mind Blown

Lumisty – You have no idea =)

Lumisty – a film that changes shape like a superhero.  Multiple options, but the gist is that the film is clear from one direction, from another angle its frosted (obscuring the view IN OR OUT).  Check this out:

Smart Glass Alternative – Privacy on/off film controlled by wi-fi or wall switch