Gyroscope

The working principle of a gyroscope is based on gravity. It is explained as the product of angular momentum, which is experienced by the torque on a disc to produce a gyroscopic precession in the spinning wheel.
The invention of the gyroscope is usually attributed to the French physicist Jean-Bernard-Leon Foucault in 1852. He certainly invented the word and also used his gyroscope to demonstrate the rotation of the Earth.
I just like playing with it. Creating this blip has taken far longer than it should have done.