Character interaction

If there is more than one character, how do they interact?
- Ignorant
- Avoid
- Repel
- Attack / devour

If the characters are moving in an environment, how do orient themselves within it? Are there physical forces?
- Barriers
- Physical forces (wind, magnets)

How does a character respond to user interaction?
- Avoid / follow
- Change properties (color, motion, etc)

Examples

- Letterscapes (Peter Cho)
- RotatoWorm (Marius Watz)
- Boids (Craig Reynolds)