- Photographer Jasper James uses the double exposure technique for his series 'City Silhouettes'
- James began experimenting with combining cityscapes and silhouettes in 2006
- Using Poloroids as a 'sketchbook' he was able to find the right exposure settings before shooting on film
(CNN)For a decade, British photographer Jasper James has shot some of the world's most populated cities for his ongoing series, "City Silhouettes." Using double exposure, a technique that combines two images, James juxtaposes dense cityscapes with lone individuals.