Well, I'm not totally convinced it's not like anything to be a rock. But this is the generally widely-used object of "an object without qualia".

You are apparently a believer in some degree of panpyschism. That's fine. Conscious is like gravity - it's just a part of the universe and there's no explanation for it other than that it is experienced by anything with (mass, for gravity ; ??? for consciousness).

I'm not opposed to this explanation, I'm just not (yet) convinced that it's the right one.