Possible objects such as million-carat diamonds and talking donkeys are not abstract.

In the more expressive, modal version of his theory, Zalta defines ordinary objects \((O!)\) to be those that might be concrete. The reason is that Zalta holds that possible objects (i.e., like million-carat diamonds, talking donkeys, etc.) are not concrete but rather possibly concrete. They exist, but they are not abstract, since abstract objects, like the number one, couldn’t be concrete. Indeed, Zalta’s theory implies that abstract objects \((A!)\) aren’t possibly concrete, since he defines t