It isn't. It's one of the greatest debates in philosophy, the separation of body(physical) and spirit(intelligence). That's besides my point though. Even if my intelligence is just a product or construct of another intelligence, it still exists. The intelligence typing these words, no matter its form, origin, or location, indeed exists, at least to those who observe it (you being one of those observing) simply due to the fact that it is being observed. This is the proof of my existence. By "observe" I don't mean that you are literally seeing intelligence, but the products of it.