] Tachi's cloak - a shiny raincoat that serves as a movie
] screen, showing imagery from a video camera positioned
] behind the wearer - is more gimmick than practical
] prototype. Nonetheless, from the right angle and under
] controlled circumstances, it does make a sort of ghost of
] the wearer. And, unlike traditional camouflage, it's most
] effective when either the wearer or the background is
] moving (but not both). You don't need a university lab to
] check it out: Stick a webcam on your back and hold your
] laptop in front of you, screen facing out. Your friends
] will see right through you. It's a great party trick.

What a great Halloween costume idea:)