The synchronization is due to the clocks transferring energy to each other via the coupling bar in the form of mechanical vibrations. ... In 2002 a team led by Kurt Wiesenfeld at Georgia Tech in the US designed and built a simplified version of Huygens' experiment using mechanical metronomes instead of pendulum clocks.

Why does spontaneous synchronization occur?

Spontaneous synchronization is a remarkable collective effect observed in nature, whereby a population of oscillating units, which have diverse natural frequencies and are in weak interaction with one another, evolves to spontaneously exhibit collective oscillations at a common frequency.

How do metronomes Synchronise?

How it works: The five metronomes sit on a very light FoamCore® board which, in turn, is supported by two aluminum cans on their side. The support is so light that it can react to the side-to-side motion of the metronomes' arms, thus coupling them weakly.