I can't help but think of Gustave Doré and its illustrations of hell, watching the desperate configurations of a large swarm of boids under attack within a too small constraint volume. The project began experimenting with the predator/ prey behaviour, which can be simply expressed as a rule that defines a different proximity to boids belonging to different classes. From these dynamic (but frozen) configurations it's possible to feel the emerging quality of 'fear'. 'Damned' is a Processing applet that creates a DXF file from a frame, here you can see some rendered scenes.
1 / boids explosion
2 / spherical constrained crowd, under attack
3 / vortex
4 / another crowd shape
5 / elliptical constraint shape
6 / cubic constraint cage, boids run under attack