let a=0;
function setup() {
createCanvas(500, 500);
background(255);
}
function draw() {
background(255,10);
a+=0.085;
noFill();
push();
stroke(0,70);
translate(230,230);
rotate(a);
translate(-100,-100);
rect(0,0,300,300);
pop();
push();
stroke(0,170);
translate(230,230);
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://cdnjs.cloudflare.com/ajax/libs/p5.js/1.1.9/p5.min.js"></script>