 But the concrete/abstract distinction seems no more perspicuous than the object/property distinction, and itself cries out for explication. Nearly everyone can agree on the things that belong in each category, but precisely in virtue of what they belong in that category remains a matter of debate. Perhaps this is a reason to rest content with thinking of the object/property distinction as the abstract/concrete distinction. The latter seems intuitive, and resists analysis in more fundamental  terms.[10]