This map uses dirt from every state, and it’s made by an 85-year-old retired ad agency art director. His favorite soils came from Colorado (“quite reddish”), Maine (“pale and sandy”), and Mississippi and Alabama (“deeply colored with iron oxide”). The soils have varying degrees of acidity, and each is a slightly different color.
Read more about the map and Les Gregor’s process. If you like it, you can purchase one! Personally, I love how gritty and ‘American’ it feels (yes, including the irony of the artist’s home country) and would LOVE to own one…