Actually, I thought navel was a kind of orange. Which would mean the artisan races should spend lots of time contemplating their navels - and then creating still-life paintings of them...
The thing you unscrew to make your butt fall off. What an ancient joke. Oh, and in case someone didn't get it, a navel is a bellybutton. Which, according to the ancient joke referenced previously, is there to keep your butt attached. (By the way, anyone see the Simpsons episode where Homer ate so much at a carnival that his bellybutton changed from an "innie" to an "outie"?)
All right, we now return you to your regularly scheduled topic. Sorry for the almost-funny interruption.