So you may have seen the self replication robot cube video and this video is a somewhat more practical application of a similar idea. In this video it starts out with a chair sitting in the middle and then the chair falls apart onto the floor. Next up the chair starts to re-assemble itself automatically (as in it's a robot chair). The seat of the chair puts out some wheels and then moves around re-attaching the legs and back of the chair to itself. Finally, the chair stands up back into it's regular chair shape all by it's self. I couldn't come up with a real world application where you would need a robot chair to assemble itself because the materials involved are so much greater than say a molder plastic chair. It's rather Jetsonesque though.