submission by Anisha for the hand (View the other submissions)
int x = 0
int y = 255
int r = random(255)

function setup(){
  var myCanvas = createCanvas(windowWidth,windowHeight); //you must keep this line unmodified
  rect(width/2,height/2,50,50)
}

function draw() {
  //start writing your code here

  fill(y, r, x);
  if (mouseX > windowWidth/2){
    ellipse(mouseX, mouseY, random(200), random(200));
  }

  x ++;
  y --;

}