The Physico-theological Argument

In the first statement (if I remember correctly) you made an analogy between things we know that were created by man (like a clock) to any complex thing, that just as complex things we know were created by an intelligent designer, so too are more complex things like the universe. Although when the question was asked why God himself was not created by an intelligent designer, you claimed that this analogy only applies to things in our experience, and for things outside our experience it is not correct to say that complex things need an explanation. I didn’t really understand what the explanation was in this division, why did the analogy only apply to things in our experience?