I finally got back to the book yesterday. Visual Exercise 4 has you trying lots of tools to draw. This is a play lesson. The goal is to forget about composition and just explore the possibilities of using marks in quantity. I do like that it encourages you to use tools you have and also tools you didn't think of using. I don't think the pictures loaded in order, but I don't really think that matters. I used an old credit card, brush, stencil brush, calligraphy marker, calligraphy pens with different nibs, the edge of spiral bound notebook paper after it is torn, a Zig pen, a Fantastix tool and a soda pop cap. The one I didn't like too much was the Fantastix tool using Tsukineko ink. I think I like the real calligraphy pen and India ink the best. But the credit card was fun. I did try to be careful, but ink is ink and it is messy. And it's always good to use the credit card for painting instead of spending.