In the yellow abstract I did today (see Forward Progress), the first yellow wash was not absorbed by the lines I scratched into the surface of the paper. In my study below, I blotched watercolor onto paper that was already scored, and found the same result: the scratches did not soak up the pigments.
To make the lines visible, I rubbed the paper’s surface with charcoal and then brushed it off. The result is two compositions on one page. I only became aware of the foreground design after rubbing charcoal into the paper.
The goal is to make each design simultaneous independent of each other and depended upon each other.