 Finally, some philosophers see the main distinction not as between abstract and concrete objects but as between abstract objects and ordinary objects, where the distinction is a modal one – ordinary objects are possibly concrete while abstract objects (like the number 1) couldn’t be concrete (Zalta 1983, 1988). In any case, in the following discussion, we shall assume that the abstract/concrete distinction is a division among existing objects, and that any plausible explanation of the distinction should aim to characterize a distinction among such objects.