exist because Time City
keeps re-using the same patch of space and time. They appear as insubstantial, inaudible people performing the actions that brought the time ghost into being.
There are two varieties:
- Habit ghosts are created from habitual behavior. If a person repeats the same behavior often enough, it leaves a mark.
- Once-ghosts are created from moments of high emotion or urgency. One of the most famous examples of this is the Endless ghost.
A remarkable thing about time ghosts is that, because Time City keeps re-using the same patch of space and time, they appear throughout the City's history, even before the events that brought them into being have occurred. At the time that A Tale of Time City begins, there are still several notable once-ghosts, including the Endless ghost, whose origins still lie in the future.