Luz Externa.

"Luz Externa was one of the most ambitious productions of the Mexican super 8. The script is based on the monologue of Ernesto, a jipiteca machín, who tells a friend of his mystical adventures with his girlfriend [...] What was probably the super 8 film that best portrayed the countercultural world of the first half of the seventies in Mexico was not seen in its time, despite the expectation that its filming caused in the press." - Álvaro Vázquez Mantecón, El Cine Súper 8 en México