Trace on the hexagonal ground-plan, A, B, C, D, E, F, which serves as
base to the building, the six semi-diameters, G A, G B, G C, G D, G E, G
F, and on each of them rear perpendicularly two plain mirrors, joining
all exactly at the centre, G. These glasses should be very thin, set
back to back in each pair, and cut with a double bevel where the point
of junction falls.
[Illustration: Fig. 124.]
Ornament the six corners of the outer edge of the structure with as many
columns and their bases, into which the outer edge of the mirrors fit by
their grooves. Make the roof in any fashion you please.
In each of the six triangular spaces comprised between every two of the
glass walls little pasteboard figures in relief, representing six
different subjects, which will have a pleasing effect in a hexagonal
form.
With some ornament harmonizing with the temple hide the junction of the
mirrors.
_Action._—When any one looks into one of the six openings between any
two of the columns, the object there will be repeated six times, which
will be an extraordinary illusion if the subjects are suitable to the
arrangement of the mirrors.
_Observation._—If a part of a fortification is mounted between two of
the mirrors, such as a curtain and two demi-bastions, the entire citadel
will be seen, surrounded by six bastions; apportion of a ball-room, with
a quadrille party and one gaselier, will be multiplied, and so on.
The construction can be made on a triangular or square base, and is
equally agreeable; but as only three or four subjects can be shown, and
the parts of those subjects are parallel with the sides of the temple,
and therefore take a form like that at its base, the result is not so
wonderful.
[Illustration: Fig. 125.]