Magic lantern

 A magic lantern, also known by its Latin name lanterna magica, is an early type of image projector that used transparent screens (usually glass), one or more lenses, and a light source

 It was mostly built in the 17th century and is usually used for entertainment purposes. In the 19th century, it was increasingly used for education.

In the magic lantern apparatus, light is directed through a small rectangular sheet of glass—the lantern slide that shows the image—and onto a lens in front of the apparatus. The lens on the front of the device is set to focus the slide at a distance from the screen, thus forming a large image of the slides on the screen.

At first, the images were painted on glass slides with black color, but later transparent colors were also used.