This is a really cool video that operates on a principle of physics: that the transfer of momentum will result in alignment of motion. In other words, as the metronomes tick, they are transferring force to the table, and due to the design of the table that force is dampened and dissipated through the table causing it to move. That motion begins to impart a force upon the metronomes – amplifying the signal of those aligned with the table, and dampening the signal of those out of alignment. Eventually all of the metronomes will align!
Anyway, check it out!