void setup(){
  size(400,400); 
  frameRate(4);
  smooth();
 }
  void draw() {
	
  background(0);
  float a=random(height);
  float b=random(width);
 
  drawMyShape(a,b);
 }
  void drawMyShape(float a, float b) {

  fill(200, 40, 200);
  ellipse(50+a,b , 50,50);
  fill(255, 253, 110);
  ellipse(100+b,a , 60, 60);
  noStroke();
  fill(160,100,250);
  rect(b,a, 40, 40);
 }