What's even trippier is that other people have created little versions of Minecraft that you can play inside Minecraft. They look like crude versions of the real thing, of course, just like Minecraft itself looks crude to us, and how we probably look crude to the aliens controlling us.
Via Hans Lemurson
Our entire solar system lives within the tip of that torch.
It's not just Minecraft, of course -- any game with a building mechanic attracts this kind of craziness. For instance, the kid-friendly side-scrolling game LittleBigPlanet lets you build your own levels, but players quickly took the idea to crazytown, doing things like building other games and creating extremely complex mechanisms like this giant working calculator. That's right; they took the cartoon blocks and pulleys and levers provided by the game with the intention of letting you build a wacky obstacle course for your character, and instead (with a mere 1,600 parts) built a crude, working computer. You put in a number on each side, add your operation, hit the big red button ... and boom! You get your result.
It can add and subtract, as well as do decimal and binary conversions.