The anonymous British artist’s 70-foot-long mural was unveiled on Thursday, and it protests the imprisonment of the Turkish-Kurdish artist and journalist Zehra Dogan, who was sentenced last March for painting the destruction of a predominantly Kurdish town, with Turkey’s flag flying over rubble. I’ve painted things much more worthy of a custodial sentence,” Banksy said in a statement to the New York Times. Banksy’s sparse mural mostly consists of black hash marks, which visually represent jail cell bars and count the number of days that Ms. Dogan has spent in prison. A rendering of Ms. Dogan herself peers out of one of the cells, with her left hand gripping a bar that doubles as a pencil. She still has 18 months left to serve, and remains unaware of the mural, according to a news release.