...when you don't consistently sketch everyday.Or carry around a sketchbook. It's been a looooong time since I've sat down and sketched. On the other hand it was tons of fun to sit down and draw! Even though I took my sketchbook out of backpack (it's usually in there) and all my pens are mostly dried up from not using them, this is proof that any ordinary paper and pen is more than enough to sketch. It was a very liberating experience! Go Joe!