I've been sharing some pages from my Stillman & Birn Zeta sketchbook. Color is so brilliant on this paper that I love using it to create charts and try out techniques, but I don't always want to keep them. So I destroy the original by painting or coloring over most of it and then create something else.
Originally, I used this page to mix various Stephen Quiller acrylic paints. I had intended to apply a thin coat of black gesso, letting much of color show through. The gesso came out faster than I expected and I ended up covering almost all of color. Except for that lower left corner. I decided to leave it.
I saw a cat in the color--actually three different cats, depending on how I looked at it, and that inspired the rest of this Zentangle-Inspired artwork.