A large clothespin
This giant clothespin was installed in Chaudfontaine Park, Belgium.
A surface is treated with a cup
This looks like the acupuncture technique of cupping, where a cup is placed over the skin and a vacuum created by burning an alcohol soaked cotton ball to consume the oxygen. Except of course that this technique is applied to a solid wall.
Someone is trapped inside this wall and is either actively trying to escape, or has literally "hit the wall."
A canvas woman
This partially unclothed woman seems to have accepted her fate.
– Turkish artist Mehmet Ali Uysal>>
– Giant Clothespin Sculpture, Bored Panda>>