This photograph on the cover of the January 2003 issue of the International Journal of Bifurcation and Chaos shows an experimental apparatus for studying synchronization in driven nonlinear systems. Details are found in the article "When Two Coupled Pendulums Equal One: A Synchronization Machine" by H.J.T. Smith, J.A. Blackburn and G.L. Baker; IJBC 13, 7-18 (2003).