The Ferris wheel is a large wheel-shaped mechanical construction facility. Hanging on the edge of the wheel is a passenger cabin (Gondola). Passengers sit on the Ferris wheel and slowly turn up, and they can overlook the surrounding scenery from a height. The most common Ferris wheel generally appears in amusement parks (or theme parks) and garden fairs. As a kind of playground motor game, it is collectively called the "Three Treasures of Paradise" together with the roller coaster and the carousel. However, the Ferris wheel often exists alone in other occasions, and is usually used as a viewing platform for activities.