text: // create_checkbox grid
  function setup() {
    createCanvas(400, 400);
    frameRate(1);
    // frameRate(10);
    background(255);
    grid_step();
  }
  
  function draw() {
    grid_step();
  }
  
  let x_pos = 0;
  let y_pos = 0;
  let a_width = 60;
  
  // Draw the next rect in the grid
  function grid_step() {
    while (y_pos < height) {
      fill(random(0, 255));
      rect(x_pos, y_pos, a_width, a_width);
      x_pos += a_width;
      if (x_pos > width) {
        x_pos = 0;
        y_pos += a_width;
      }
    }
    y_pos = 0;
  }
  
  