The spirit world is a vast universe running parallel to the mortal realm. There are all sorts of animals, creatures, and plants of intelligence living here with their unique magical abilities. Plants can grow upside down or from the side, and others will float; they can also speak to one another, and only other spirits can understand them. There are many gateway portals throughout the spirit world, each with its specific purpose. The spirit world can be entered mentally or physically. Most enter through meditation or even dreams. Others enter physically through portals located in the mortal realm, where guardians (half-mortal, half-spirit) watch over the portal and pass between the worlds as they please. These guardians include monkeys, leopards, tigers, trolls, snakes, cranes, dragons, and pangolins; each guardian has its own specific island, though the mortal creators (Mo and Ruo) watch over the entire world. The spirit realm's creators, Ai-de and Sei, allow the spirit world to be more chaotic, yet everything is still balanced out in the end.