createCanvas(400, 400);

  //this turns the stroke off, so the colors can SHINE

  noStroke();

} 

​

function draw() { 

  //notice that I have NO BACKGROUND!

  //this helps colors show up & blend

  //the way I want them to.

  //red circle

  fill(255, 0, 0, 1);

ellipse(100, 100, 100, 100);

​

  //green circle

fill(0, 255, 0, 1);

    ellipse(170, 100, 100, 100);

​

  //blue circle

    fill(0, 0, 255, 1);

    ellipse(145, 150, 100, 100);

}