Contributed by Vittorio Colaizzi / Some painters insist on calling themselves painters rather than artists, and it’s clear why. “Art” designates is a broad category that admits almost anything, while painting is a tradition centered on a medium. In his recent book, Duchamp’s Telegram, Thierry de Duve argues that, while Marcel Duchamp did not single-handedly invent art in general, he perceived and announced its arrival. Before that, art was inconceivable outside the context of specific media such as painting, sculpture, and architecture. Duchamp’s insight, of course, did not spell the end of painting, Rather, it gave painters the option of retreating into self-sustaining insularity or more expansively embracing how painting and other art overlapped in terms of image, touch, plane, color, space, and voice. Joan Thorne, whose recent paintings are now on view at David Richard Gallery, has taken the latter course, to impressive effect.