A cave named Gruta de las Pesadillas was known to be a place whereby entering the cave with a torch or lamp, you would see your darkest nightmares reflected onto the shiny minerals from the inside. However, years later the isolated cave was found, and since it is now on United States soil, the County of Los Angeles decided that the cave should be closed.

Current scholars believe that the cave has nothing special, nor that it presents any sort of danger for people who go inside. However, the mineralogist Thomas Klein, who has dedicated his entire life to the understanding of the effects of optical mineralogy on the mind, believes that the light reflected from the solid surfaces would place people in a state of trance where one could connect to the liminal space between their inner and outer self.

Contacting a historian of the department of anthropology from a university in Southern California, I was given access to a written document describing the experience of a man at the cave in 1914. He writes about leaving his house, going to the cave, and his experience there.

This film is a recreation of the described event.