A Waltzer.
A Waltzer is a fairground ride that consists of a number of cars which are free to spin individually. The Platforms of the ride are not flat and the cars spin, the weight of the riders causing each car to rotate. Sometimes an operator will ride the platform and spin the cars by hand providing a more intense ride.
Trivia
Waltzers are enclosed in a stadium setting which is heavily equiped with discotheque fittings - strobes, lasers and fog machines.
Manufacturers of Waltzers include: Jackson, Lakin, Maxwell, ARM UK and Fairtrade Services.
Most Waltzers were Ark rides, but have been modified to Waltzers.
A Waltzer in operation.