If you're familiar with Chinese astrology, even if only from placemats at Chinese restaurants, you may know what animal marks the year you were born in according to their calendar. For me, born in 1967, it's the Year of the Sheep (or Goat, but I prefer the placemats that say Sheep). Rob was born in the much-cooler Year of the Dragon.
But apparently, in addition to an animal, your birth year is also assigned an element -- fire, water, earth, metal or air. Here's where I get the cool element: My birth year makes me a Fire Sheep, whereas Rob's makes him a Wood Dragon. There are fun qualities assigned to each element/animal combo, of course. Heh, note that "Sheep make excellent editors."