We joke about it, but an early and very cheap robotic floor cleaner I had was one of those weasel balls constrained in a flat ring harness with a dusting cloth

We joke about it, but an early and very cheap robotic floor cleaner I had was one of those weasel balls constrained in a flat ring harness with a dusting cloth underneath. It was entertaining and not completely useless. Put a guinea pig in there and you'd get the same effect.