(Watch it! I know, it's 62 minutes and the quality is shit, but it's great! And it's not out on video or dvd.)

Professor: Well, as I interpret what you're doing here, this is all a very complex discussion of Reality versus Illusion. The perfect subject for the television medium!

The Man in the Cube: What do you mean, television?

Professor: Well, this is a television play.

From IMDB

Yahoo Group for "The Cube": "It was a Sunday afternoon, February 23,1969, when the anthology show NBC EXPERIMENT IN TELEVISION aired a one-hour teleplay by Jim Henson, then best known for being the man behind "Ralph the Dog" on the JIMMY DEAN SHOW. Jim Henson created this unique film, titled simply THE CUBE. It starred Richard Schaal as a man trapped in a white cubical room. He had no idea how he got there or where it was. And although anyone could enter, he couldn't leave...."

This was obviously the inspiration for "the remake" by Vincenzo Natali....

OK, boingboing ran it first....