Devised by August Mobius, a Mobius strip is a seemingly one-sided surface that loops upon itself. Since its invention, the strip has proved an inspiration to Escher and a useful metaphor for Borges and Kafka. Now Argentine director Gustavo Mosquera—working from A.J. Deutsch’s book, A Tunnel Called Moebius—has used the loop to construct a movie mystery that’s both metaphysical and political: A subway car containing 30 people inexplicably vanishes from Buenos Aires’ baroque underground rail system. The premise plays on the universal sense of intrigue suggested by underground passageways as well as the specifically Argentine resonance of the notion of “disappearing.” The director will be on hand to introduce his film and a companion documentary, The Making of Moebius, which recounts how 42 University of Buenos Aires cinema students participated in making the feature. At 8 p.m. at Hirshhorn Museum & Sculpture Garden’s Ring Auditorium, 7th & Independence Ave. SW. FREE. (202) 357-2700. (Mark Jenkins)