Photo from Flickr user Maitri. Creative Commons licence.
Just like the PlayPump, a seesaw has been developed to harness children's energy in a productive way.
Coventry University design student, Daniel Sheridan, has drawn up plans for a seesaw which will generate electricity when children play on it. He thought of the idea when he was working in Kenya as a volunteer, and saw the immense need for electricity to enable development.
Now that he has won a £5,500 prize for his idea, he hopes to build a working prototype and attract further interest and investment.
As an example, he has calculated that five to 10 minutes use on the see-saw could generate enough electricity to light a classroom for an evening. He says, "Ultimately I would love to design a whole playground of different pieces of equipment that could enough generate electricity to power a whole village."
Thanks to J. for pointing out the BBC article to me.