A N T H O N Y L A W R E N C E : Stop Motion Animator & INSTRUCTOR
A one way mirror is reflective from one side, but transparent on the other.
By facing the reflective side of such a mirror towards the reflective surface of a conventional mirror, an infinite reflection occurs!
When you insert a narrow set in the space between the two mirrors, the set is reflected infinitely and takes on the appearance of an endless tunnel!
The advantage of this over a painting is that the perspective shifts as the camera pans or moves.