let roff = 0;

let goff = 20;

let boff = 50;

​

function setup() {

    createCanvas(windowWidth, windowHeight);

}

​

function draw() {

    let r = noise(roff)*255;

    let g = noise(goff)*255;

    let b = noise(boff)*255;

    roff += 0.01;

    goff += 0.01;

    boff += 0.01;

    background(r*2);

    fill(g,b,r);

    rectMode(CENTER);

    push();

    translate(width/2,height/2,50,50);

    rotate(g/50);

    rect(0,0,b,b);

    pop();

}