let a=-1;
let b=50;
let c=100;
function setup(){
createCanvas(500,500);
background(255);
}
function draw(){
background(100,10);
a+=9;
b+=15
c+=0.3;
noFill();
push();
stroke(0);
translate(250,250);
rotate(a);
translate(-100,-100);
rect(0,0,250,250);
pop();
push();
stroke(0,60);
translate(250,250);
rotate(b);
rect(0,0,50,50);
pop();
push();
stroke(0);
translate(250,250);
rotate(c);
rect(0,0,30,30);
pop();
}
<script src='https://cdn.jsdelivr.net/npm/p5@1.1.9/lib/p5.min.js'></script>