Just click anywhere on the page and marvel. Double-clicking or resizing clears the screen. And it's mostly as easy as that. Oh, and there are 4 seasons, clear the screen to get a random season. Oh! And try drawing!
If you don't see anything, that's because you have an old browser. I suggest Chrome, as it is by far the fastest.
Please don't change the code except for the first line. There is a small copyright message in it and it is made to cover the whole screen.