"Common paintings and prints may be considered as parts of a panoramic representation, showing as much of that general field of view which always surrounds a spectator, as can be seen by the eye turned in one direction, and looking through a window or other opening. The pleasure from contemplating these is much increased by using a lens. There is such a lens fitted up in the shops, with the title of _optical pillar machine_, or _diagonal mirror_, and the print to be viewed is laid upon a table beyond the stand of the lens, and its reflection in a mirror supported diagonally over it, is viewed through the lens. The illusion is rendered more complete in such a case by having a box to receive the painting on its bottom, and where the lens and mirror, fixed in a smaller box above, are made to slide up and down in their place to allow of readily adjusting the focal distance. This box used in a reverse way becomes a perfect camera obscura. The common show-stalls seen in the streets are boxes made somewhat on this principle, but without the mirror; and although the drawings or prints in them are generally very coarse, they are not uninteresting. To children whose eyes are not yet very critical, some of these show boxes afford an exceeding great treat." _Cosmoramas and Dioramas._ "A still more perfect contrivance of the same kind has been exhibited for some time in London and Paris under the title of _Cosmorama_ (from Greek words signifying _views_ of the _world_, because of the great variety of views.) Pictures of moderate size are placed beyond what have the appearance of common windows, but of which the panes are really large convex lenses fitted to correct the errors of appearance which the nearness of the pictures would else produce. Then by farther using various subordinate contrivances, calculated to aid and heighten the effects, even shrewd judges have been led to suppose the small pictures behind the glasses to be very large pictures, while all others have let their eyes dwell upon them with admiration, as magical realizations of the natural scenes and objects. Because this contrivance is cheap and simple, many persons affect to despise it; but they do not thereby show their wisdom; for to have made so perfect a representation of objects, is one of the most sublime triumphs of art, whether we regard the pictures drawn in such true perspective and colouring, or the lenses which assist the eye in examining them.