interesting processing i saw on twitter lost the link though :(

lines.pde

int n=200,i,s,t;
float a[] = new float[n*4],d;

void setup() {
  size(800,800);
  colorMode(3);
  blendMode(2);
  for(i=0;i<n*4;i++) {
    a[i] = 400-random(800);
  }
}

void draw() {
  clear();
  noStroke();
  noFill();
  
  for(i=0;i<n;i++) { 
    for(s=i;s<n;s++){
      for(t=s;t<n;t++){
        if((d=dist(a[i],a[i+n],a[s],a[s+n]))<99 &&
          dist(a[i],a[i+n],a[t],a[t+n])<99){
          fill((i+s+t)%255,255,255,999/d);
          triangle(a[i],a[i+n],a[s],a[s+n],a[t],a[t+n]);
          a[i]+=a[i+n*2]/5e3;
          a[i+n]+=a[i+n*3]/5e3;
          if(abs(a[i])>400) {
            a[i+n*2]*=-1;
          }
          if(abs(a[i+n])>400) {
            a[i+n*3]*=-1;
          }
        } // end of if
        
      } // end of for loop t
    } // end of for loop s
  } // end of for loop i
} // end of draw