The rephotographic method, with its rigorous demands for systematic return, exact replication of vantage point, angle of view, and lens choice, had emerged originally out of the need for scientific evidence of change over time in ecological niches. Vergara's use of the technique was not exclusive; indeed, Vergara made other pictures, including of residents and smaller details. Beginning with The New American Ghetto, Vergara increasingly interwove these photographs, along with quotes from outside writers, fragments of comments by citizen-dwellers in the cityscapes he developed, and his own writing.
The rephotographic method, with its stringent requirements for systematic return, exact replication of vantage point, angle of view, and lens choice, emerged originally to provide scientific proof of change over time in ecological niches. Vergara's use of the technique was not unique; indeed, Vergara created other photographs, including those of residents and smaller details. Beginning with The New American Ghetto, Vergara increasingly integrated these pictures, along with quotes from external authors, fragments of comments by citizens residing within the cityscapes he developed, and his own writing.