The stuff you describe about physical art is only valid within a jurisdiction that has legislated ownership of physical items. You can very well take control of an object without owning it and lock it up in a custom warehouse. You can be custodian of it if the legal framework allows for that, it still can be yours of someone takes ot from you physically. Depending on the jurisdiction, it is possible that despite you paid to own the physical art piece, you are still not allowed to take photos of it in purpose to reproduce the images of it. You may own it but maybe you can't break it down or take it away from its place.
These are all constructs that societies had it differently and it's all matter of legal and political processes.
There's no inartistic ownership, it is a social construct that happens within a community.
The blockchain doesn't operate within the traditional legislations, ownership within a blockchain means people who use it accept the record as true. If it says that you own it, you own it(within the community of people who use blockchain).