It’s turtles all the way down in today’s interactive xkcd panel. Randall Munroe invites you to enlarge the comic by scrolling and see lots more as the pixels enlarge. But careful! If you click at any point, you may lose the whole thing. Scroll in the right place, and you’ll see a story unfold. It has to be an infinite loop, but it’s a very big loop. I have yet to reach the point where anything repeats.
The comic is for a special occasion: the launch of Munroe’s new book What If?: Serious Scientific Answers to Absurd Hypothetical Questions. Read more about it here.