Random Object Walker - OpenProcessing

mySketch
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let walker;
​
function setup() {
  createCanvas(windowWidth, windowHeight);
  background('lightgrey');
  
  walker = {
    x: width/2,
    y: height/2,
    diameter: 50,
    colour: 255,
  }
}
​
function draw() {
  noStroke()
  fill(walker.colour--)
  circle(walker.x, walker.y, walker.diameter)
  
  walker.x = walker.x + random(-10, 10)
  walker.y = walker.y + random(-10, 10)
  
  if (walker.colour <= 0) {
    walker.colour = 255
  }
}