void setup(){
  size(600,600); 
  frameRate(30);
  strokeWeight(0);
  smooth();
}

void draw() {
  background(0);
  float a=random(height);
  float b=random(width);
  float c=random(height/2);
  float d=random(width/4);
  drawMyShape(a,b,c,d);
}

void drawMyShape(float a, float b, float c, float d) {
  fill(255,0,0);
  rect(a, b, 35 ,35);
  fill(255, 100, 0);
  ellipse(c, d, 35, 35);
}