obadonke_processing/Noc/05/Noc05_08_SimpleToxi/Particle.pde
class Particle extends VerletParticle2D {
  Particle(Vec2D loc) {
    super(loc);
  }
  
  void display() {
    fill(175+random(2));
    stroke(0);
    ellipse(x, y, 16, 16);
  }
}