Decades (sigh) ago I played with a permanent "one-person ferris wheel"-like structure on (I think) Scheveningen beach. I consisted of two posts maybe 3 m tall and 1 m apart supporting a beam on an axle. On one end of this beam was a "hamster wheel" but fixed to the beam and on the other was a counter-weight. Everything was heavy galvanized steel and built to last. There were several there. I've never seen anything like them before or since.
The idea is to get into the wheel and by walking, change the center of gravity of the system and the whole thing would rotate, lifting the rider 4-5 m high. I could get it going faster than I wanted to at the time. :-)
What's it called? Are there any left?