 The object blue is not identical with the property of being blue; neither is it identical with the set that contains the property of being blue as its sole member. Neither is the object round and blue identical with the set of the property of being blue and the property of being round. The property of being blue is not itself blue, the property of being round is not itself round. Analogous considerations hold for sets of properties: sets have neither colors nor shapes. But the object blue is blue, and the object round is round, and so forth.