has to do with In cold blood part two of the book Persons unkown
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When looking at the photographs, Dewey hoped the he "might see something." Dewey described it as one of those instances where you're trying to find the hidden animals. I might compare it to Where's Waldo. The aspect of the photos that foreshadows the capture of the killers would be the footprints he spots in a photo of Mr Clutter........ diamond-patterned soles; something not visible to the eye, but something visible on film because of the flashbulb used to take the photograph.
In Cold Blood/ Page 96