The Great Slydini — Tony Slydini — is featured here on two videos from the Dick Cavett Show, along with commentary by Cavett on his New York Times blog.
Cavett explains that there are no mirrors, and no tricks with the cameras.
The first video is intact; the second video has some outages, but just stay with it and they clear up and continue (you'll hear the sound but not see the images for short times.)
If Cavett could post these to YouTube, then these could become "viral videos" like nothing else in the history of the Net.
Slydini says: "You can do anything, if you know how."
Watch and be amazed.
The Great Slydini on the Dick Cavett Show, 1977
The Great Slydini on the Dick Cavett Show, 1978