On Sunday afternoon, a mural by Mark Rothko at theTate Modern was defaced.
It was done in front of other visitors to the gallery, and the defacement looks like a bit of graffiti - but it also appears to be a scrawl of the name Vladamir, and the phrase "a potential piece of yellowism".
The BBC's arts editor, Will Gompertz, told the Today programme that yellowism is "a conceptual arts movement that takes its cue from dadaism which started in World War I in Zurich and was an anarchic and nihilistic arts movement."
But he added: "Going up in a public gallery to draw on a very much-loved work of art is not a work of art, it's an act of vandalism."
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