Between every reality, bonding existence together, is the Spime.
An ever-changing sea of possiblity, waiting to manifest in realms. All the never-was and forever-will be. The ocean from which energy, emotion, and everything is drawn. It is the source of magic (Qualia) and you are reading this from a condensation of this potential, existing as colors, sounds, and various states of hunger.
In your world, space moves through time. Within the 64 known realms of our current bottle-nexus of the spime, it isn't uncommon for the opposite to be true.
One of the most common forms of transportation, spime ships, sometimes known as jaunters, are used to travel the Spime from realm to realm.