I find him to be like a child in all of the best ways. So many master programmers never seem to stray far enough outside of their comfort zones to have to ask basic questions about anything. Armstrong always seems to be operating at the edges, trying to come up with something that's never been done before, but definitely doing something that he personally hasn't done before.

All of the old Ericsson Erlang guys seem a bit like that, though:) The right people were in the same place at the same time.