Via BitFlicks, the method behind the madness (hint, it’s not really LEGO stop animation):

“What you can see is a very basic quasi-stop motion animation. Quasi because there was actually only one LEGO block involved, which was photographed in multiple positions and then composited in a photo editing program as a multi-layer image. Producing the animation was then a simple matter of masking the LEGO blocks and then hiding or displaying certain layers. The end result was a simple stop motion animation that didn’t suffer from the usual random variations in lighting and position.”

Not quite as exciting as if it were done literally, but still cool to watch.