let a=0;
function setup() {
createCanvas(500, 500);
background(255);
}
function draw() {
background(255,10);
a+=0.085;
noFill();
push();
stroke(0,70);
translate(250,250);
rotate(a);
translate(-100,-100);
rect(0,0,300,300);
pop();
push();
stroke(0,170);
translate(250,250);
rotate(a++);
rect(0,0,30,30);
pop();
push();
stroke(0,160);
translate(250,250);
rotate(a++);
rect(0,0,150,150);
pop();
}
<script src='https://cdn.jsdelivr.net/npm/p5@1.1.9/lib/p5.min.js'></script>