SOURCE

let x=50;
let d=50;
l}
function draw(){
background(120);
x+=speed;
if(x>width+d/2){
x=-d/2;
}
ellipse(x,60,d,d);
}et speed=2;
function setup(){
createCanvas(500,150);

if(x>deepth+d/2){
x=-d/2;
}
ellipse(x,60,d,d);
}