YouTube video [via Engadget] shows the little hamster in the walker:
|The hamster moves the walker “legs” by running in the plastic sphere. He is facing away from the camera, you can see the ears and an eye, top left inside the sphere.|
This reminded me of a character in the animated movie “Bolt” [amazon.com, amazon.uk, itunes.com]: Rhino the hamster.
|Rhino the hamster in “Bolt” [source]|