Meet the Sturzmännel: a tumbling acrobatic automaton that can do backward somersaults. This toy was inspired by tumbling mechanical toys in the 1800s that were made with mercury. Due to toxicity and high price of mercury, the new version uses weights and levers to do its trick.
These staircase jugglers known as Purzelchinesen and Stursmännel were reinvented by Werner Toys. The above video shows how they work.