Remote rocking chair

We're not exactly sure what the reasoning behind remote rocking chairs is, other than scaring the crap out of ol' granny, but since it's coming out of the Ars Electronica festival it must be cool, right? Maybe not, but that never stopped us before. The remote rocking chairs hook up 2 chairs to a PC running some control software, and both chairs get a tilt sensor and linear motor. When you make one chair rock, the other chair responds by rocking along with it. The picture's a little hard to see, but the wooden chair looks more than a bit uncomfortable, which spastic rocking could only make that much more painful.