Minecraft wiki entry for Building_a_metropolis, associated text: Other Worldly: A metropolis could be made to exist as if in a different world or dimension. As such, the city should have elements depending on the special rules of that dimension. For example, the world could have weird gravity, special technology, exist on clouds or be entirely made out of candy. The way a city functions within a different world would have to be fully considered while creating the metropolis and add many opportunities for creativity.