let a=0;
let x=50;
let y=90;
let r=100;
function setup(){
createCanvas(500,500);
background(200);
}
function draw(){
r=random(60,150);
a+=190;
y=r*sin(radians(a))+250;
x=r*cos(radians(a))+250;
fill(random(180))
ellipse(x,y,60,60);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>