I was watching this video a moment ago and was struck by a certain similarity between a Bible verse and what David Chalmers was saying. Essentially David was arguing the idea that the iPhone is somehow an extension of our mind.
His argument reminded me of an argument Jesus made saying if you have lusted in your heart, you have already committed adultery.
Both David and Jesus make the point that the internal and external, in a certain respect, are very intertwined.
Both arguments require a bit of faith in that they force us to hold loosely the perceived separation of our internal consciousness and the external world.
Both challenge us to reconsider the boundary lines of our identity.