// The setup function runs ONCE at the BEGINNING of the program
    function setup() {
      createCanvas(500, 500);
    }

    // The draw function runs OVER AND OVER right AFTER setup is finished
    function draw() {
      draw_clock();
    }

    const spacing = 50;
    // I added a call to the draw function.
    // This function also doesn't need a parameter "obj"
    // function draw_clock(obj) { --> function draw_clock() {
    function draw_clock(obj) {
      background(0);

      let h = hour();
      let m = minute();
      let s = second();
      let secAngle = map(s, 0, 60, 0, PI * 2);
      let minAngle = map(m, 0, 60, 0, PI * 2);
      let hourAngle = map(h % 12, 0, 12, 0, PI * 2);

      // Variables width and height are the width and height of the drawing canvas
      translate(width / 2, height/2);
      rotate(PI * 1.5);
      strokeWeight(8);
      noFill();
      stroke(255, 0, 0);
      arc(0, 0, 300, 300, 0, secAngle);
      stroke(0, 255, 0);
      arc(0, 0, 280, 280, 0, minAngle);
      stroke(0, 0, 255);
      arc(0, 0, 260, 260, 0, hourAngle);
    }