I meant it in a metaphorical sense, not in a literal sense. As Strrrng said these functions take place only within a human mind, not as actual events in reality. You only will get Ti from a Ti person, etc. With Friedman I believe his Ti-ness is demonstrated in his presentation of ideas in ostensible frameworks that are unified around a central criteria. Sorry that must sound abstract, but I'm having difficulty saying why a typed person is that type, it's just different things I see.