The planes in fantasy novels referred to a parallel universe or a multi-dimensional space used to describe different story worlds or forms of existence. Although the concept of planes is very common in novels, in reality, scientists believe that we only exist in a three-dimensional universe. There are no parallel universes or multiple dimensions. Although planes in fantasy novels may exist, they are usually fictional. The existence of planes in novels could stimulate the readers 'imagination and make them feel different worlds and life experiences, but they did not exist in reality.