createCanvas(400, 400);

  background(0);

  y = height/2;

}

​

function draw() {

  noFill();

  stroke(255);

  noLoop();

  drawCircle(width/2,height/2,300);

  // background(220);

}

​

function drawCircle(x,y,size){

  ellipse(x,y,size,size);

  if (size>10){

    var new_size = size/2;

    drawCircle(x+new_size,y,new_size);

    drawCircle(x-new_size,y,new_size);

    drawCircle(x,y-new_size,new_size);

    drawCircle(x,y+new_size,new_size);

  }

}