Julian Schanbel's "At Eternity's Gate" tackles Vincent Van Gogh's life in deceptively simple ways. The film's eloquence derives in the fact that Schnabel is much more interested in the torment and the undue respect the painter of "Starry Night" never got from his cohorts. Van Gogh himself would approve of this intimate channeling — the visions and torment that seeped through the impressionist painter are dealt with head-on in Schanbel's film.