let a = 0.0;
let x=20;
let y=90;
let r=50;
function setup() {
createCanvas(900, 900);
colorMode(HSB,207,5,62);
background(950);
}
function draw() {
a+=2;
noStroke();
fill(random(430),70,800);
r=random(10,300);
y=r*sin(radians(a))+250;
x=r*cos(radians(a))+250;
ellipse(x,y,80,80)
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>