it is a carnival ride.. havent all of you rode on one of these before when you were a kid?? it spins so fast that it pushes you to the wall so you dont fall out. and it goes up and down.
*some years later on space station* Astronauts A:"Our shuttle is delayed, i'm going to take a spaceride all the way back to Earth!" Astronauts B:"You what?...sh*t where are you going!"