When I saw the today's XKCD, I thought "meh"
Then I noticed the tooltip: "Clic and drag"
So I clicked and dragged the image on the right
"Oh, cool, there is a little world here"
And I continued to drag
Again
Again
Again
Is it endless??? It's an huge comic, undoubtedly the biggest in the world!
Fortunately for our wrists, there is who made a keyboard-friendly version, making the exploration a pleasant experience!
You can also zoom backwards, finding easter eggs as a Falling Icarus, two falling whales, or someone doing surf on a Jet that it would be *impossibile* to find with "click and drag"