This work is based on "Paleolithic engravings in the Cova de la Font Major" (https://sketchfab.com/3d-models/cova-de-la-font-major-gravat-del-cavall-9a44d200825a44559abd476dd2c308dd) by Giravolt (https://sketchfab.com/giravolt), licensed under CC-BY-4.0 (http://creativecommons.org/licenses/by/4.0/).