This is a tree sketch I made with black walnut ink. I started it in the park behind Len's house last weekend, and finished it up yesterday at home. It's about 9 x 13. Some of it was done with brushes, but most of it was done with two homemade tools: a dip pen I made with river cane bamboo, and a whittled down bamboo skewer. The bamboo skewer is surprisingly versatile and holds ink better than most twigs, sticks, and whatnot that I've picked up to try.