Hamster
The kids who built this like to think of it "Borg v1.0".
Personally I think it's more along the lines of "teaching hamsters to use an overly-complicated remote controlled food dispenser"
Basically it works like this:
There are little hamster powered hamster-mobiles that are used to gather energy to power the food dispenser. As i understand it, the hamsters don't do any steering, they are simply providing the raw hamster power the little robot needs to position itself under the light source in order to charge its solar cells, then move to the other side of the environment where it uses the accumulated electricity to power the hamster pellet dispenser.
So it seems that everyone is happy. The little robots get to live up to their highest ideals (the noble pursuit of charging up a solar cell and then discharging said cell into a pellet dispenser) and the hamsters that power the robots locomotion are compensated by the dual reward of "getting to run in a little wheel" and "getting fed". Which pretty much sums up hamster heaven.
Where i come from we call that "Win/Win".