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Protesters, including Granada Hills resident Kasia Sparks, waved handmade signs objecting to the debris disposal plan and shouted in unison, “No Toxic Dump!”

In the media room at the city of Los Angeles Emergency Operations Center in downtown Los Angeles, phones of elected officials, staffers and a handful of reporters screeched in unison.

“Be the best,” the star safety’s teammates respond in unison.

ANAHEIM, Calif. — The ebullient thrum of staccato snares, thumping sousaphones, and tramping shoes all acting in unison filled the gray morning air in the parking lot outside Angel Stadium recently.

An audience clapping in rhythm, fireflies flashing in unison, or flocks of starlings moving as one -- synchronisation is a natural phenomenon observed across diverse systems and scales.