DREAMS ARE MESSAGES from the deep. Thus begins Denis Villeneuve’s adaptation of Frank Herbert’s Dune. In his dream visions, Paul Atreides repeatedly imagines his own death and the death of others. In his encounter with the Reverend Mother’s gom jabbar, for instance, he confronts a scorched corpse, warriors kneeling in defeat, and a bloody crysknife, the fabled knife of Arrakis made from the tooth of Shai-Hulud.