Entitled “When It Starts Dripping From The Ceilings” the piece comprised a tower of wooden slats with a plastic bowl at the bottom painted brown to give the impression of discolouration caused by water. The cleaner took the paint to be an actual stain and scrubbed the bowl till it looked new.
The piece of art (shown above) by Martin Klippenberger was valued by the museum at £690,000.
There may be some who would argue that the cleaning person didn't destroy a piece of art, but rather created a new art work (which might be entitled "It Has Stopped Dripping From the Ceilings.")
Relevant video: "How To Distinguish Art from Trash."
Link. Photo: EPA.