Comment by nkrisc
If someone else is sleeping on it, it’s not your couch until you remove them from it and occupy it yourself.
Unless we agree upon the abstract concept of “owning” property even while you do not physically possess it.
You need look no father than a kindergarten to see the natural way of things: the toy belongs to whichever toddler is holding it.
While not entirely comparable, it is no more absurd to extend the idea to intangible ideas as well.
Yes, a simple lock (in the concurrent software sense) is one system that could work. Harking back to my own kindergarten experience, though, I am not sure if such a system is best for minimizing disputes.