float d=random(6);

void setup() {
  size(250, 250);
  rect(50, 50, 150, 150);
  fill(255,0,0);
  ellipse(125,125,30,30);
}

void draw() {
  if(d==0){
  fill(255,0,0);
  ellipse(125,125,30,30);
  }else if(d==1){
  fill(0,0,0);
  ellipse(85,85,30,30);
  fill(0,0,0);
  ellipse(165,165,30,30);
  }else if(d==2){
  fill(0,0,0);
  ellipse(125,125,30,30);
  fill(0,0,0);
  ellipse(85,85,30,30);
  fill(0,0,0);
  ellipse(165,165,30,30);
  }else if(d==3){
  fill(0,0,0);
  ellipse(85,85,30,30);
  fill(0,0,0);
  ellipse(165,85,30,30);
  fill(0,0,0);
  ellipse(85,165,30,30);
  fill(0,0,0);
  ellipse(165,165,30,30);
  }else if(d==4){
  fill(0,0,0);
  ellipse(125,125,30,30);
  fill(0,0,0);
  ellipse(85,85,30,30);
  fill(0,0,0);
  ellipse(165,85,30,30);
  fill(0,0,0);
  ellipse(85,165,30,30);
  fill(0,0,0);
  ellipse(165,165,30,30);
  }else if(d==5){
  fill(0,0,0);
  ellipse(85,85,30,30);
  fill(0,0,0);
  ellipse(165,85,30,30);
  fill(0,0,0);
  ellipse(85,165,30,30);
  fill(0,0,0);
  ellipse(165,165,30,30);
  fill(0,0,0);
  ellipse(165,125,30,30);
  fill(0,0,0);
  ellipse(85,125,30,30);
    }
  }