void setup() {
  size(100, 100);
  noStroke();
  fill(255, 40);
  background(0);
}

void draw() {
  if (mousePressed == true) {
    fill(0, 26);
  } else {
    fill(255, 26);
  }
  
  for (int i = 0; i < 6; i++) {
    ellipse(mouseX + i*i, mouseY, i, i);
  }
}