Seen a photograph of starlings when the flock takes on the silhouette of a giant bird. I've always been fascinated by that kind of (apparent?) collective intelligence. There's seemingly no leader, but from the interactions of swarms of independent actors emerge (what seems like) a larger mind. Surely we humans exhibit such behavior also, when seen from a certain elevated perspective like statistics.
Photographs don't do justice. Stop everything now and search for videos on YouTube.
You can also search for boids to explore simple rules that replicate such dynamics.