Watch the video re-creation experiment.
While Underdown works on the re-creating the lighting and video recording conditions of the hospital corridor, the Miracle Detectives attempt get a better understanding of how and why people perceive ambiguous images the way that they do. They visit the University of Southern California to meet with Irving Biederman, a neuroscientist who researches how the brain processes images.
Biederman shows Randall and Indre the basic outline of what is commonly recognized as a typical angel shape. "[What] often happens when images are ambiguous or faint or blurry, we interpret them typically in terms of an inanimate entity. It could be a face. It could be a body. And with angels, there's a very simple shape. There are the two wings and the head and three lobes." Irv compares his outline with the photograph from Chelsea's hospital monitor, and notes the similarities.