function setup() {
  createCanvas(400, 400);
  background(220);
}

function draw() {
  // Nothing to draw continuously in this example
}

function mousePressed() {
  fill(random(255), random(255), random(255)); // Random fill color
  noStroke(); // No stroke for shapes
  ellipse(mouseX, mouseY, 20, 20); // Draw ellipse at mouse position
}