As funny as it may sound, omphaloskepsis is a word for being obsessed with your own navel. People use it as a way to describe someone who is so self-absorbed that he's lost all perspective.
The noun omphaloskepsis literally means "the contemplation of one's navel," and you could use when you see a little kid who is obsessed with his belly button. More often, it describes being so wrapped up in yourself that you lose track of the world around you — a metaphorical navel-gazing. The Ancient Greek root words omphalos, "navel," and skepsis, "reflection," combine to make a great way of describing a tendency to be self-absorbed.