@pauline Great stuff. Hemmings moving while the crowd is frozen is a kind of time-stop, or the inverse of the tennis match in "Strangers on a Train".
@pauline I've read that Antonioni ordered the Yardbirds to do that bit because he couldn't be bothered to pay for the Who. Whether true or not, the story perfectly encapsulates the essence of both Antonioni & Beck.
Basic models of flocking behavior are controlled by three simple rules: 1) separation: avoid crowding neighbours (short range repulsion); 2) alignment: steer towards average heading of neighbors; 3) cohesion: steer towards average position of neighbors (long range attraction). With these three simple rules, the flock moves in an extremely realistic way.