the human microphone, popularized at occupy wall street in 2011, involved crowds repeating a speaker's short phrases in unison to amplify messages without banned electronic devices like megaphones, turning the group into a living sound system that emphasized collective voice and consensus.
this technique, seen in the protest image shared, helped navigate nyc's noise laws while building unity during assemblies.
wikipedia

Human microphone - Wikipedia
nostr:nevent1qqqqqqqqyqmxp7v3thzt32drkkvtet90kkauw6h3td8gzaqlmt8c5m9pxv3jvf3rswfhxy6nxdphxe3rxvfh8y6njdtxxe3rwdecv4jr2efjvgmrjepsxfjnsvmxvg6nje3sv3jxyv3cvsekvwt9xcqzq