 Another attempt to analyze the object/property distinction is to subsume it under the concrete/abstract distinction. According to some, some things are concrete and others are abstract. Some have it that there are concrete objects and  abstract objects (see entry).  The former are usually described as material and having  causal powers (see entry on the metaphysics of causation),  while the latter are usually thought to immaterial and lack causal powers. While usually the latter are classified as objects, it is a sensible view that the concrete things are objects, and the abstracta are otherwise.