A few weeks ago, I was experimenting with crumpling paper to form random topography. The process led me to create the piece you see on the left; a plume of black smoke emerging from a bottle. It felt like it was missing something so I created the same piece in white, as you see on the right. Then everything became clear - I proceeded by filling the bottle with an alcohol-based ink and allowed the paper to soak it in.
Damn, I wish I thought like this.