Cool! If you hold down "CTRL" and click it, it changes shape. If you keep clicking it, it eventually disappears. To get it back again, just hold down "CTRL" and click the background again.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi