When audiences consider 3D as a medium, the abiding image seems to be of items popping out from the screen — a limb here in “Jaws 3D,” a dildo there in “Jackass 3D” — and perhaps that is indeed how most filmmakers have used the medium. Not enough directors have capitalized on the ability of 3D to convey a sense of physical depth; fewer still have seized on the possibility of adding philosophical depth. Thank goodness, then, for Wim Wenders. The first of two new films by the German veteran in this year’s Cannes official selection, “Anselm” is a tour...