Experimenting with my new Kuretake brush pen. What fun. The ink line is so sensitive. Because of the thick/thinness, and because control is more challenging (um, almost absent), I'm just working fast and larger. This pen is so much more fluid in its touch than the disposable brush pens I've used before. I don't know whether it is the fun of ink in cartridges, or if the brush is made of a different kind of fiber, or if it is just the adventure of buying something and having all (ALL) the documentation and packaging in Japanese, but I'm infatuated.