The whole world and its inhabitants are made entirely out of pillows, blankets, and bedding. The sky is entirely made of one sheet with cloud print. Hills and mountains are great rumpled quilts. Houses tend to be made of stacked cushions and pillows. Animals and trees are made out of pillows. Finn did not know how he got there, but that there was a small red door that he went through in Jake's pillow fort that brought him to Pillow World.
- Like Narnia in C.S. Lewis' The Lion, the Witch and the Wardrobe, Pillow World is never fully stated to be real, an alternate universe, or just an odd dream, although Finn's encounter with GOLB when leaving the Pillow World seems to strongly suggest one of the former two interpretations.
- Time also passes much more quickly in Narnia than in the real world; likewise, a lifetime spent in Pillow World is equivalent to mere moments in Ooo.