Figure 1
Phys. Rev. Lett. 105, 203904 (2010)

Merging light droplets. A computer simulation shows the transition from “fermionic” to “liquid” light. An array of fermionic light pulses is focused, causing the pulses to coalesce into a high-intensity liquid-like soliton (right), which oscillates because of its excess energy, just as a real liquid droplet would jiggle after a merger.