Spaceball: Before and After - again and again
The Spaceball is a hand-operated machine, but nonetheless the temporary space cadet spins around at a steady pace, and the speed can be easily varied, while never being too fast.
This is a human gyroscope. There are quite a few variations around, but they all claim to trace their origins back to NASA, the National Aeronautics and Space Administration, America's space agency, which uses the gyroscope to train astronauts for the experience of zero gravity. It is also a part of the training of air force pilots.
So a great experience for children. I don't think anyone came out feeling sick.
Another willing victim, and speechless onlookers.