Penta Something

function setup() {

  createCanvas(windowWidth, windowHeight); 

  background(100);  

  colorMode(HSB, 360,100.0, 100.0,100.0);

} 

​

function draw() {

  background(0);

  translate(width/2,height/2);

  foo(300,10);

  noLoop();

}

​

function foo(len,sat) {

  fill(240,sat,100,100);

  stroke(240,0,0,100);

  ellipse(0, 0, len, len);

​

  for(var i=0;i<5;i++)

  {

    if(len>2)

    {

      push();

        rotate(i*TWO_PI/5)

        translate(1,len* 0.618);

        foo(len*0.618 * 0.618,sat *1.5)

      pop();

    }

  }

}