var angle = 137.5;

var start = 3;

var a = 6;

var spot_size = 12;



function setup() {

  createCanvas(windowWidth, windowHeight);

  background(238, 238, 238);

  stroke(0, 0, 0);

  colorMode(HSB);

}



function draw() {

  translate(width / 2, height / 2);



  var theta = start * radians(angle);

  var rad = sqrt(start) * a;



  fill(map(start, 0, 2500, 0, 360), 85, 100);

  ellipse(rad * cos(theta), rad * sin(theta), spot_size);



  start++;

}