Ana Mendieta, Untitled (People looking at blood), 1973 (Click the images. The blood kinda gets cut-off)
She reproduced a scene of a crime by smearing what looks to be blood on the ground. Then, as people passed by, she documented their reactions.
She wanted to depict traces of violence in public places and create a conversation about violence and women. The blood draws attention and directly implicates the spectator with the crime because they see, but don’t do anything about it.