Histology.

I don’t know what I was doing but this emerged today. It looks like a slice through some tissue. Maybe animal or vegetable. I kept doing lay ers of pattern. A line of the drawing had to stick to rules that I set for myself, like a curve every few centimeters or a wobbly line, so that some areas are lighter and less marked than others. It actually drawn on the back of the bird doodle I drew yesterday. I could see where the ink was showing through, but then I decided to extend it further. This was the result.