SOURCE

let tx=0;
let ty=0;
let tz=0;
let nx;
let ny;
let nz=10;
function setup(){
    createCanvas(600,600);
    background(0)
    noStroke();
    nx = random(200);
    nx = random(200);
}
function draw(){
    fill(random,120,120,100);
    nx=random(tx);
    ny=random(ty);
    nz=random(tz);
    nx=map(nx,0,1,0,width);
    ny=map(ny,0,1,0,width);
    nz=map(nz,0,1,10,100);
    tx+=0.011;
    ty+=0.111;
    tz+=0.001;
    a=random(860);
    rotate(radians(a));
    rect(constrain(nx,0,width),constrain(ny,4,height),nz,nz);
}