“Rocks can be Gneiss,” my geology teacher would always say in school.
It’s a terribly cheesy joke, I know. Haha.
Below are some concept designs of rocks I did for a project being developed by the folks over at Animal. Who would’ve thought they could look so different?
Arched rocks are my favorite. 
Thanks to Kris and Mike for getting me involved.
Too see the image in higher resolution click here.
Too see more sketch work click here.