The Endless Well

In the setup you see that the burning lamps are getting farther and farther apart and there are an infinite number
of them. In fact, there are a finite number of lamps and
two mirrors facing each other. So the light coming from the object to the first mirror
creates an image in the same mirror. This image is an object
for the second mirror, which in turn creates an
image of the image in the first mirror. This situation
continues forever for two opposite mirrors and leads to the formation of an infinite image of the object (the object
mentioned here is the lamp).