Wentel Crates

Mr. Bumble is at the circus when he hears children complaining that a circus is fun, but what they really want is a fairground with a ride that shakes you up and down! Mr. Bumble says he'll arrange that, but he has no idea how.

Then he runs into Kwetal. He gives him an umbrella, and Kwetal is so grateful that Mr. Bumble can ask for something in return. He asks Kwetal to come up with an attraction for the children. Kwetal doesn't know what to do; he doesn't have much material to work with, there are only a few crates. But then he thinks: if I connect the earth rays to the momentum of the crates... and voilà!