Errol Morris describes his invention:
The Interrotron™ is a two camera arrangement with Teleprompters designed to create a different kind of filmed or videotaped interview. Recently, it has been substantially modified with additional cameras. In theory, there is no limit to the additional cameras that can be used; in practice, we have used twenty cameras. I call this arrangement (with 20 or more cameras) the Megatron™. Think of it as a super-charged Interrotron™. Eye-contact is as important with the Megatron™ as it is with the Interrotron™, but here there is the possibility of eye contact with many more cameras. We have now used up to ten.

How can this be done?
Since the Interrotron™ makes use of two-way mirrors and television monitors, it is possible using lipstick cameras to add additional cameras behind the two-way mirrors. Any lipstick camera in principle can be used, but we have used modified Sony XC-999 lipstick cameras supplemented with C-mount Angenieux and Schneider lenses. The result is something between a David Hockney collaged still photograph and something we have never seen before.

As with the Interrotron™ there is a style of cutting, of montage, made possible. This is one of the most important aspects of this patent claim, which is both a claim for an innovative use of existing technology and a system of editing this material which avoids the pitfalls of more traditional techniques.
Errol Morris on Eye Contact (March 16, 2000):

Q Is eye contact important?
A For primitive man it was the difference between life & death. How else could you decide who was friend or foe? Does that hairy beast over there want to invite you to dinner or have you for dinner? Does he see you as a collection of sinew boiling in a pot? It was looking into the eye of that other being.... What are its intentions? What are its thoughts? Modern man has incorporated eye contact into many aspects of life. But what about television? A newscaster looking into the camera is not looking at anyone. He is simply looking into a dead lens. A piece of glass with a diaphragm behind it.

And if there's a prompter, the situation is no better. Now, he's simply looking into the "face" of dead copy, verbiage, lines on a page, the prompter version of text splayed out in readable form. What does that mean? I'll tell you what it means, it means NOTHING. None of this is about a relationship.

Q A relationship? What kind of relationship?
A Say, a relationship between one person and another. It's about the relationship of a person with a machine.

Q But cameras are machines, aren't they? How could it ever be different?
A I'm so very glad you asked that question. The answer is: There is a way. And that way is the Interrotron™.