let yPos = 200;

​

function setup() {

  createCanvas(400, 400);

  background(220);

}

​

function draw() {

  // let xPos = 200;

  // let yPos = 200;

  xPos = xPos + random(-5, 5);

  yPos = yPos + random(-5, 5);

  ellipse(xPos, yPos, 50, 50);

}