the genre is chromatography, but of a particular kind. the material process here is actually quite interesting, and is actually much more a kind of photograph than it is akin to other kinds of chromatography; the paper is treated with silver nitrate, as photographic paper is: https://www.milkwood.net/2011/11/06/soil-chromatography-with-eugenio-gras/
but that said I also read this as a kind of mandala, or similar sort of image meant to elicit or focus meditative attention
