Vandalism of art is intentional damage of an artwork. The object, usually exhibited in public, becomes damaged as a result of the act, and remains in place right after the act. This may distinguish it from art destruction and iconoclasm, where it may be wholly destroyed and removed, and art theft, or looting.
Numerous acts of vandalism against art exhibits are known and some objects, such as Mona Lisa, Night Watch and The Little Mermaid, have been intentionally damaged several times. Many vandals were diagnosed with a mental disorder and some, such as Hans-Joachim Bohlmann, had a history of attacking artworks. A vast amount of damage consists of leaving a minor scratch, a stuck chewing gum, a pencil mark and so on, and usually escapes publicity.[3] More visible acts of vandalism were premeditated, as the tool of destruction – a knife, paint, acid or hammer – was intentionally brought to the scene. In most cases, the artworks were restored. Restorations were costly and time-consuming and in many cases were followed by shielding the artwork from future attacks.