, the
paper may be coloured on each side with a deep blue, which will be
still better for such as are to be seen through transparent papers. It
must be of a proper size for the figure you intend to exhibit. In this
paper cut out with a penknife several spaces, and with a piercer make
a number of holes, rather long than round, and at no regular distance
from each other.

To represent revolving pyramids and globes, the paper must be cut
through with a penknife, and the space cut out between each spiral
should be three or four times as wide as the spirals themselves. You
must observe to cut them so that the pyramid or globe may appear to
turn on its axis. The columns that are represented in pieces of
architecture, or in jets of fire, must be cut in the same manner, if
they are to be represented as turning on their axis.

In like manner may be exhibited a great variety of ornaments, ciphers,
and medallions, which, when properly coloured, cannot fail of
producing the most pleasing effect. There should not be a very great
diversity of colours, as they would not produce the most agreeable
appearance.

When these pieces are drawn on a large scale, the architecture or
ornaments may be shaded; and, to represent different shades, pieces of
coloured paper must be pasted over each other, which will produce an
effect that would not be expected from transparent paintings. Five or
six pieces of paper pasted over each other will be sufficient to
represent the strongest shades.

To give these pieces the different motions they require, you must
first consider the nature of each piece; if, for example, you have cut
out the figure of the sun, or of a star, you must construct a wire
wheel of the same diameter with these pieces; over this wheel you
paste a very thin paper, on which is drawn, with black ink, the spiral
figure. The wheel thus prepared, is to be placed behind the sun or
star, in such a manner that its axis may be exactly opposite the
centre of either of these figures. This wheel may be turned by any
method you think proper.

Now, the wheel being placed directly behind the sun, for example, and
very near to it, is to be turned regularly round, and strongly
illuminated by candles placed behind it. The lines that form the
spiral will then appear, through the spaces cut out from the sun, to
proceed from its centre to its circumference, and will resemble sparks
of fire that incessantly succeed each other. The same effect will