NBC Experiment in Television - Season 3 (1969)

A man awakens inside a white cube, covered in a four-by-four grid. He has no memory of how he got there and there seems no way out. But as time passes, panels open temporarily to admit an intruder or onlooker. They pop back through their panels but bar the man from going through, pointing out "this is MY door; you'll have to find YOUR door."

Documentary on Harold Pinter's characters, including a tour of many of their London hang-outs, with links by Pinter himself and five short animated sequences containing caricatured views by Gerald Potterton.