Soil Library Project / Setouchi (土と生命の図書館) could be found in the village of Hitoyama on Shōdoshima. More precisely in the library of the now abandoned school of the village.
I think it’s a very fascinating work of art from the Setouchi International Art Festival. The artist, Kōichi Kurita (栗田宏一) has collected soil samples from about 350 places all around the Seto Inland Sea area, in Kagawa, but also in other regions bordering the sea from Osaka to Kyūshū, including many of the islands in between.
The result, as you can see, consists in about 600 samples aligned in the middle of the room, creating an amazing palette that shows the diversity of soils from that part of Japan.
I don’t think I need to comment much more, do I?