[swayvil]

Given a deterministic 2d noise generator (perlin or whatever). That is to say, for any seed (X,Y) you will always get noise value Z. And given the virtually infinite 2d coordinate space. You have implied a continent, or a planet, or some kind of really large space full of nonrepeating, pretty unique, forms. And putting it through the wang filter makes these forms palatable to humans. A little more organization and you've got no mans sky.