Put kitty to work and she can reduce your electric bill! At least, that’s the idea behind this design concept from designer Yuan Gu. He came up with the idea for a hybrid electric and battery powered humidifier and air purifier. The device can be plugged into an electrical outlet, or it can run on the internal battery that is recharged when kitty rolls the ball. It’s called the Wool Ball.
Interesting concept, but kitty might catch on and boycott.