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++;
}