[pbhjpbhj]

So you deny classification of similarity - fingers have structural similarities that allow them to form a class of object/item, this class and it's per-person sub-classes have a reality that to me is not entirely abstract.

Even without classification we can create arbitrary groupings of physical objects, those groups have cardinalities. (Unless your materialism denies the existence of more than one thing/substance; philosophy is fun, eh.)

I'm for pragmatism in such things however.