float x;
  int centreY;
  int centreX;

void setup() {
  size(600, 400);
  x = width/5;
  centreY = height/2;
  centreX = width/2;
  smooth();
  background(0); }


void draw() { 
  
   strokeWeight(random(30));
   
 for (int i = 4; i > 0; i--) {
      strokeWeight(random(30));
      stroke(204, random(255), 0);
      fill(204, random(255), 0);
      ellipse(centreX, centreY, x*i, x*(i-1));}
      
      strokeWeight(random(30));
      stroke(random(255), 102, 0);
      fill(random(255), 0, 0);
      ellipse(centreX, centreY, x, x); 
      
      
}