Framing passersby with light and shadows is a pretty common technique in street photography, and one that we've featured a number of times in the past.
Singapore-based photographer Weilun Chong frames his subjects with something that's a little more concrete -- literally. His "Please Mind the Gap" project features portraits of subway commuters framed in the gaps they're told to mind.
School of Visual Arts photography student Michael Schmidt has been working on a series that documents the commuters who ride the Staten Island Ferry that shuttles people between Staten Island and Manhattan. It's an environment in which people are mostly stationary and often lost in their thoughts or absorbed in the things being displayed on their smartphones.
For the past five years, photographer Amy Stein has been driving across America and capturing portraits random strangers who are stranded on the side of the road after having their cars break down. She often drives on freeways hours upon hours before coming upon a new subject for the series.
New York-based artist and storyteller Ourit Ben-Haim's Underground New York Public Library project first began as sketches of rough photographs of people reading on trains. The photos are unrefined and voyeuristic, like reading over a stranger's shoulder.