Oops.
Martin Kippenberger’s When It Starts Dripping From the Ceiling (Wenn’s anfängt durch die Decke zu tropfen), on loan from a private collector to Museum Ostwall in Dortmund, suffered an attack motivated by … a strong work ethic. Upon noticing what appeared to be grime in part of the sculpture, a cleaner apparently thought all it needed was a good scrubbing. Unfortunately, it had been deliberately-placed paint to represent dried rainwater and the sculpture is “now impossible to return it to its original state.”
via The Guardian