That usually happens to a looks planet, from sheer scope of the size of the planet, especially when its clustered with dead trees as we see. Not to mention the Human World is specifically Earth, even the space around Jupiter, of all things, is habited by another "world".
Lemme look for it, but I believe there was something that stated that they were parallel in size. It was the original thread discussing this.
Again, probably just a visualization.
@Yobo not all alternate realms are universe sized, there was a thread that actually pointing out Barian World was about the size of the Earth, but I can't find it, just give me a while.