Place two pieces of looking-glass, one at each end, parallel to one
another, and looking over, or by the edge of one of them, the images of
any objects placed on the bottom of the box, will appear continued to a
considerable distance.
Or, line each of the four sides of the box with looking-glass, and the
bottom of the box will be multiplied to an astonishing extent, there
being no other limitation to the number of images but what is owing to
the continued loss of light from reflection. The top of the box may be
almost covered with thin canvas, which will admit sufficient light to
render the exhibition very distinct.
The above experiments may be made very entertaining, by placing on the
bottom of the box some toy, as sentry soldiers, &c.; and, if these be
put in motion, by wires attached to them, or passing through the bottom
or side of the box, it will afford a still more entertaining spectacle.
Or the bottom of the box may be covered with moss, shining pebbles,
flowers, &c.; only, in all cases, the upright figures between the
pieces of looking-glass should be slender, and not too numerous, else
they will obstruct the reflected light.
In a box with six, eight, or more sides, lined with looking-glass, as
above, the different objects in it will be multiplied to an almost
indefinite extent.