Vampire Ecology in the Jossverse - “The spiral pattern is referred to as a ‘stable focus’, and it indicates that the ecological system in Sunnyvale is probably fairly tolerant of the ebbs and flows of vampire activity. Of course, there is always a possibility that some combination of events (such as, by way of illustration, the Apocalypse) that would bump this system out of its comfy little trough, and then all bets are off.”