"And if you stay Below long enough, you'll be completely invisible Above, sorry to say. Unfortunate side-effect of having fallen through the cracks."

She paused then, looking ceilingward for a moment, thinking that over, "No, not completely, there will always be some who can see you, the ones falling through the cracks themselves, or those who never learned how not to notice."

A wry little smile, "It's complicated. But for the most part, once you've gotten this far there's no going back."