Iteration - OpenProcessing

mySketch
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// "Embedded Iteration + Randomness"
// 9.1.18
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let refresh = true, box_width = 40, box_padding = 10;
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function setup() {
    createCanvas(400, 400); background(255); noStroke(); 
}
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function draw() {
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  if (refresh) {
    refresh = false;
    clear(); background(255);
    
    for (let x = 5; x <= width - box_width; x += (box_width + box_padding)) {
      
        for (let y = 5; y <= height - box_width; y += (box_width + box_padding)) {
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            let rand = Math.ceil(random(15)); // 1 in 15 chance there is a circle
            if (rand == 1) {
                fill(66, 134, 244);
                ellipse((x + box_width/2) - 2 , (y + box_width/2)-2, box_width, box_width);
            } else {
                fill(195, 198, 204);
                rect(x-2, y-2, box_width, box_width);
            }
        }
    }
  }
}
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function mousePressed() { refresh = true; }