High Quality Content by WIKIPEDIA articles! A waltzer is a fairground ride that consists of a number of cars which are free to spin individually while rotating around a central point like a carousel. The floor of the ride is not flat and the cars rise and fall gently as the ride spins, 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. Because of the combination of the ride spinning and the spinning cars, large varying g-forces are perceived as the spin of the car lines up with the rotation of the carousel and at other times opposes it. Most amusement parks and carnivals require the rider to be at least 42 inches tall unless accompanied by an adult. Reasons for this include that a small child might otherwise be thrown out onto the waltzer platform, causing serious injury or death, and may not be able to hold on sufficiently tightly to avoid this.