I should be able to change the creatorship / ownership of a Thing

(User Story, Investigate , Priority: High, Test Status: No automated tests yet , Reported By Bad Link: Thing 3y284oe not found, )
Summary: Requested by Eric, as part of managing his Space. He makes use of _creator for a bunch of stuff, but that raises a problem: how do you change that? How do you reassign the "ownership" of a Thing? It's a reasonable desire.
The implication here is that we have overloaded the concept of "creator": it means what it means, but it also means "owner" in a very real sense. That relationship should be weaker.
Offhand, the best approach is probably to add _owner as a separate but closely related idea. This would inherit from _creator, and would usually be the same value. But unlike _creator, it makes semantic sense to be able to change this value with a function.