var squareSize = 50; var lineSize = 10; for (var x = lineSize / 2; x < 400; x += squareSize) { for (var y = lineSize / 2; y < 400; y += squareSize) { fill(123, 165, 20); rect(x, y, squareSize - lineSize, squareSize - lineSize); } } fill(0, 0, 0, 20); noStroke(); ellipse(200, 200, 10, 10);