submission by jtoy
function setup(){
  var myCanvas = createCanvas(windowWidth,windowHeight); //you must keep this line unmodified
  rect(width/2,height/2,50,50)
  background(0,0,0)
  count = 0
}

function draw() {
  //start writing your code here
  fill(255,0,0)
  count += .1
 translate(width/2,height/2)
  ellipse(cos(count)*50,sin(count)*50, 20, 20);
}