let alreadyOutTop = false

​

function setup() {

  createCanvas(600, 600);

//  background("red");

}

​

function draw() {

  background("pink");

  fill("blue")

  circle(300,300,298);

  fill("purple");

  circle(300,300,200);

  fill("yellow");

  circle(300,yLocation,100);

  fill("green");

  circle(yLocation,600-yLocation,50);

  fill("blue");

  circle(300,yLocation,25);

  fill("purple");

  circle(600-yLocation,yLocation,13);

  fill("yellow");

  circle(300,yLocation,6);

  fill("orange");

  circle(yLocation,yLocation,60);

  fill("blue");

  circle(yLocation,yLocation,30);

  if(yLocation == -3){

    alreadyOutTop = true

    yLocation = 600

  }

  if(alreadyOutTop && yLocation == 300){

    // don't do anything

  }

  else{

    yLocation = yLocation - 1

  }

}