let total = 9;

​

function setup() {

  createCanvas(400, 400);

    let col1 = [100, 100, 255, 255];

  let col2 = [255, 100, 255, 255];

    let w = width / total;

    let h = height / total;

    for (let i = 0; i < total; i++) {

        let x = i * w;

        for (let j = 0; j < total; j++) {

            let y = j * h;

            let circle = new Circle(x, y, w, h, col1, col2);

            circles.push(circle);

        }

    }

  let iMiddle = total * floor(total / 2) + floor(total / 2);

  circles[iMiddle].w = 60;

    circles[iMiddle].h = 60;

    for (let i = 1; i <= floor(total / 2); i++) {

        circles[iMiddle + i].w = 20;

    }

}

​

function draw() {

  background(220);

  translate(width / total / 2, height / total / 2);

  for (let c of circles) {

    c.show();

  }

}