It is the fogged mirror we are peering into searching for the truth. When the negatives were developed, most of the footage was found to be fogged. The unfixed film is then fogged (physically or chemically) and 'second-developed'. Film in the cameras would have been fogged by this radiation. Even so, a few batches of records still had some problems and became fogged. Re-exposure fogged the silver halides that were not developed in the first developer. After reaching the top, the train drops into a fogged headchopper tunnel. In reversal processing, the material is fogged before the second developer. Most of the sex scenes are fogged.