Found these … er … ‘drawings’ in an underground passage. Both walls were nearly completely covered by these. PP: developed one color and one b&w version, cut the robots out of the color version and pasted them into the b&w version (with some blending added).

"Transformers" | Olympus E-P1 + Lumix 20/1.7 @ f/1.7, 1/80 sec, ISO 400