// Daniel Shiffman

// http://natureofcode.com

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// Simple Recursion

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function setup() {

  createCanvas(640, 240);

}

​

function draw() {

  background(255);

  drawCircles(width / 2, height / 2, 320);

  noLoop();

}

​

function drawCircles(x, y, radius) {

  stroke(0);

  strokeWeight(2);

  noFill();

  circle(x, y, radius * 2);

  if (radius > 4) {

    //{!2} drawCircles() calls itself twice. For every circle, a smaller circle is drawn to the left and the right.

    drawCircles(x + radius / 2, y, radius / 2);

    drawCircles(x - radius / 2, y, radius / 2);

  }

}

​