Neither art nor anti-artPolice are investigating after a painting by the great 20th century abstract artist Mark Rothko was defaced at the Tate Modern in London. The writing on the bottom-right corner of the piece appears to read: "Vladimir Umanets, A Potential Piece of Yellowism." Mr Umanets, who is originally from Russia, said he had written on the painting, but insisted his aim was not to destroy or deface it. "Some people think I'm crazy or a vandal, but my intention was not to destroy or decrease the value, or to go crazy. I am not a vandal," he said. Mr Umanets, who studied art, is one of the founders of "Yellowism", which he describes as "neither art, nor anti-art".