The Tourbillon is a mechanical part of a pricey watch, which was invented by Abraham-Louis Breguet in the late 18th century. It is a device that helps to reduce the effects of gravity on the accuracy of the watch by mounting the escapement and balance wheel in a rotating cage. This allows the watch to remain accurate even when it is in different positions. The Tourbillon is considered to be one of the most complex and expensive parts of a watch, and is often seen as a symbol of luxury and craftsmanship.