The collective motion of large crowds becomes predictable when density surpasses a certain threshold. Observations from the San Fermín festival in Spain, where crowd density reached up to nine people per square meter, revealed that groups of several hundred people behaved like a fluid, oscillating predictably every 18 seconds without external stimuli. Similar patterns were noted in the 2010 Duisburg Love Parade, suggesting these insights could help anticipate crowd behavior in confined spaces. R

CROWD AT OSMEÑA BLVD. GETTING BIGGER WATCH: Crowd density continues to build along Osmeña Boulevard as of 1:20 p.m. on Sunday, Jan. 18, with more spectators arriving ahead of the Sinulog Grand Parade. | via Pia Piquero #CDNDigital #Sinulog2026 Watch our livestream here: https://l.cdn.ph/CDNDSinulog2026 | CDN Digital