createCanvas(400, 400);

  colorMode(HSB, 360, 100, 100);

}

​

function draw() {

  background(220);

  // Draw 6 rectangles

  for (let i = 0; i < 6; i++){

    // Use the value of i 

    // (which is different each time we go through the loop)

    // to calculate a value for rectX

    let rectX = i * 60 + 25;

    // and to calculate a value for rectHue.

    let rectHue = i * 20;

    fill(rectHue, 80, 100);

    rect(rectX, 100, 50);

  }

}