@kaye, @Code-Jack You’re talking about folders in the classic sense, like in Google Drive or most operating systems – a multilevel tree where an object is “physically” placed in a dedicated location. I agree that such a structure isn’t usable. I meant to use folders only as an example to illustrate hierarchical organization, where objects can be clearly arranged relative to each other. In other words, I was referring to the ability to present such a hierarchy as a kind of “view”, not the underlying architecture of how objects actually work. I guess that wasn’t very clear from my post – my apologies.
In my example, the hierarchy (Franchises → D → Dune → Books → Children of Dune) doesn’t prevent the object (book) from appearing in multiple “branches” at the same time while still remaining a single object.
That’s what I’m referring to here: