Write what you LIKE

Austin Kleon explains on page 45 that if you write what you like while you are pumped about it, you are much more likely to write something interesting about it. The traditional advice is to write what you KNOW. Austin argues that this leads to mundane and boring lifeless crap. The idea (if I'm interpreting him correctly) is to do what you are passionate about, while you are passionate about it. When you know something inside out and backwards, up side down and polka-dotted, chances are that it just isn't interesting anymore. Or, at least it would be much more difficult to make it interesting to others because you will skip and miss simple things about what you know with the assumption that they already know those simple details and would be bored with them as well.