Tellurix is a Tellurion. These devices are illustrating the movements of the earth and moon relative to the sun.
The Tellurion is powered by a hand crank. The ratio of the gears causes, that twelve revolutions of the crank are required for one orbit around the sun. One revolution of the crank corresponds approximately a month.
Tellurix looks not only visually interesting by its skeletonized design and it catches all the eyes. It is also wonderful to explain the seasons and the phases of the moon.