Spotify wrapped my year idiotically in that the top three spots were taken by the alto-range vocal exercises I do every day, leaving as a footnote the actual music I listen to, which is apparently, um, Mitski and Bach.
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.