interview OLIVIER ZAHM introduction JEFF RIAN self-portrait DASH SNOW with his father Dash Snow’s journey from the life of a furtive underground tagger to the upper-eschelon of New York galleries was uncalculated but no accident. The madness of a runaway’s life distilled down to art. It’s not yet an art movement, but it is a seismic rumbling in the Manhattan art underground. It emanates from the studios of Ryan McGinley, Dan Colen, and Dash Snow, three artists who form the core of a whirlwind of interest. McGinley, primarily a photographer, and Colen, a sculptor and collage-maker, are the more aboveground of the three. McGinley, now 29, was the youngest artist ever to have a solo show at the Whitney Museum. One of the sculptures of 28-year old Colen sold to the Saatchi collection for $500,000. Another sculpture shown at Deitch Projects, composed of a wall covered in collages and…