Created using Sketch2Tweet tool

Sketch code

int i, s=1024, r;
void setup() {
  size(s, s);
  noStroke();
}
void draw() {
  r=8<<++i%6;
  fill(-(r<<(i/s))+(i%24)*r, 270-r);
  shapetangle(i/9*8%s, 8*i*i*i%s, r, r);
}//#p5

void shapetangle(int x, int y, int w, int h ){
  if ( random(1) > 0.2 ){
     ellipse(x,y, w,h);
  }
  else{
    rect(x,y, w,h);
  }
}