It's been six months since an artist installed a plywood sculpture in front of the Bronx River Art Center that resembles a "14-foot-tall tagger's dream" — and the artwork is still graffiti-free. Even after the Daily News gave some ink (and seemingly jinxed) Diego Medina's geometric sculpture "Aurora," the unpainted structure has remained unpainted. So in a News follow-up, the artist tells the tabloid the experience "renews my hope in the public and the community." He added: "It reaffirms my good spirits in the way that the community appreciates art." What are the chances this is all an elaborate plot by the vandal squad to lure graffiti writers to into a trap in West Farms Square?