The idea of synchronization occurring between dipoles has likely been considered before, but like the dipping bird analogy [in #22](http://forum.azimuthproject.org/discussion/1529/the-indian-ocean-dipole-iod-and-enso/?Focus=13472#Comment_13472), there is a great physical analogy to what may be happening to create the close alignment. See the curious phenomenon of the automatically synchronizing metronomes.



![metronomes](http://i.ytimg.com/vi/kqFc4wriBvE/0.jpg)

Any guesses as to what causes this and to how the behavior might be manifested as correlated dipoles?