The kaleidoscope

What you can do here
Set the kaleidoscope so that your field of vision is evenly lit. Slowly move the device around its axis. Observe the resulting image transformations. Note the symmetry of the image.

How it works
The set of mirrors inside the kaleidoscope causes the image of the objects placed inside to multiply. The mirrors’ configuration is also responsible for the symmetry of the image.

Interesting facts
Images created by multiple mirror reflections were known to the ancient Greeks. In the modern times, the first kaleidoscope made up of two mirrors was invented by a British physicist Sir David Brewster in 1816. It initially served as a scientific instrument and only became a popular toy later on.