let a=0;
let x=0;
let y=0;
let r=10;
function setup(){
createCanvas(500,500);
background(200);
colorMode(HSB,400,100,50);
}
function draw(){
r=random(30,125);
a+=1;
y=r*sin(radians(a))+250;
x=r*cos(radians(a))+250;
fill(random(90),random(90),random(123))
ellipse(x,y,50,50);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>