Check it out: a chair that follows you around! The chair has an RFID chip and the human has a card to activate it. When the human leaves the perimeter in question (sounds like Star Trek), the chair goes back to its original spot, like Spot the Dog. This brain child is from Jelte Van Geest, a student at the Eindhoven Design Academy.
(Link in French: consottisier.blogs.liberation.fr, Tip: Laurent)