“Hello/Goodbye” is a moss graffiti diptych collaboratively made by Sprout Guerrilla and Toronto-based illustrator Jennifer Ilett. The two felt panels each feature a human face alongside text and abstract symbols. In the first panel, a girl holds up a peace sign and says hello in a speech box. In the second, a woman with her eyes closed says “No” and “Goodbye.” As a pair, the images blur the conventional distinctions among illustration, graffiti, and landscaping, blending methods of expression and openly manipulating natural resources for artificial means.

 Via designboom