Note: My question assumes a conceptual distinction between minds and the external world, regardless of whether they're actually two different kinds of substances.
There seems to be widespread agreement that the universe we currently inhabit is considered physical, but what about hypothetical worlds that behave completely differently? To illustrate my point, imagine that there are several other inhabited worlds, each in their own isolated space:
- World A is completely different from ours, but it still follows the same set of laws that we call physics. By sheer coincidence, there's an Earth-like planet in which a tomato-like species has evolved.
- World B follows a completely different set of laws. For some reason, it still has something that resembles tomatoes.
- World C is collectively formed and manipulated by the minds of its inhabitants, and it follows no other laws. Tomatoes can be found here too, because people like tomatoes.
All three worlds are conceptually distinct from minds (and mental properties) in exactly the same way, so they deserve a common adjective. Obviously, World A is physical, but I'm not sure whether the other two qualify. Does the adjective physical apply only to worlds that obey the laws of physics?
- If the answer is yes, then what would be the proper adjective to describe all three worlds? Terms like objective or non-mental seem too broad, because they could also encompass certain abstract concepts (e.g. numbers).
- If the answer is no, then what would be the proper adjective to describe only World A, or at least only World A and World B?