Sometimes I like to sit with a black pen and just doodle. It's always been a way to relax and just let my mind clear itself.
I've read that doodling helps with memory and retaining whatever it is you're listening to while making marks on paper.
This one is from this morning. I didn't want to dust and sweep the house as I normally do on Saturday mornings, so got out my box of pens and pre cut watercolor paper, put on some nice Classical music and just started making marks...
I used a uni-ball AIR. which makes a nice solid black line. It didn't run out of ink and the pen didn't skip a single time. It dries fairly quick, but when you are basically washing the paper with ink, it can smear a bit if you are not careful.