Many a work by Banksy
I believe the answer is:
mural
(Other definitions for mural that I've seen before include "Wall decoration" , "Wall art" , "Drawing on a wall" , "Artwork" , "Wall design" .)
I believe the answer is:
mural
(Other definitions for mural that I've seen before include "Wall decoration" , "Wall art" , "Drawing on a wall" , "Artwork" , "Wall design" .)