Incredibly Complex Triple Exposures Created In-Camera

"In order to complete some of these images, I went on a citywide search. I learned how light falls in Seattle, became the ultimate tourist and used all the history books I'd devoured as my guide," said Yam, "Sometimes I was looking for a metaphor, sometimes a precise moment. Other times, it was just a simple object that carried symbolism. I spent close to 400 hours working on this project. Ultimately, three things were necessary: a lot of patience, a pair of comfortable shoes and a light ."

http://www.mymodernmet.com/profiles/blogs/marcus-yam-global-city-triple-exposures