Infinity Apartment
The Infinity Apartment was an apartment which functioned as an extension of Jenny Everywhere's being. As a result, it could exist in an arbitrary number of realities at once, its red door opening wherever the Jenny in the Apartment wished. This gave this Jenny an infinite number of neighbours from various parallel realities, not all of whom were aware of the special nature of the apartment next to theirs, at least at first. She could also enlist “flatmates” into the Apartment, allowing them to claim some of the infinity of rooms within the Apartment; when they claimed a room, it became a perfectly stable slice of their original reality, but before then the unclaimed rooms were islands of shifting possibility, full of “what could have been and what might still be”. (COMIC: Infinity Apartment)