SOURCE

function setup() {
  createCanvas(300,500);
}

let a=0
let b=0
let c=0

function draw() {
  //left 1
  noStroke();
  fill(255,0,0);
  rect(0,0,100,500);
  push();
  translate(100,250);
  fill(0,0,0);
  a+=0.5;
  rotate(a);
  rect(0,0,30,30);
  pop();
  fill(0,255,255);
  strokeWeight(3);
  stroke(255,255,255);

  //left 2
  noStroke();
  fill(255,128,0);
  rect(100,0,100,500);
  push();
  translate(200,250);
  fill(0,0,0);
  b+=0.05;
  rotate(b);
  rect(0,0,30,30);
  pop();
  strokeWeight(3);
  
  //left 3
  noStroke();
  fill(255,255,0);
  rect(200,0,100,500);
  push();
  translate(300,250);
  fill(0,0,0);
  c+=5;
  rotate(c);
  rect(0,0,30,30);
  pop();
  fill(255,128,0);
  strokeWeight(3);
  stroke(255,255,255);

}