This film is screening as part of a 'Head Trips: Films for the Inner Eye' season at the Barbican. You can find all the details here.
Chicago Reader review:
Cold, documentarylike images of the Sahara are used in a grotesque retelling of the story of creation in Werner Herzog's 1971 experimental feature. Every shot has a double edge of harsh reality and surrealist fantasy, as when the landing of a jet plane, repeated nine or ten times, becomes an odd spiritual symbol, at once banal and mysterious. You'll either be bored to death or fascinated—for me, it's Herzog's most interesting film.
Here (and above) is the trailer.