There are a dozen ways I would like to answer that question, but the simplest is

There are a dozen ways I would like to answer that question, but the simplest is the same one we use for pornography: I know it when I see it. And in this case it’s “I know it when I talk to it.” If you can judge integration while blindfolded then you can tell. If you want me to list all the properties we sense when doing so I suppose I could do that with painful accuracy. And I suspect only conservatives can do so.