As a part of “Zoe Strauss: Ten Years” — the Philadelphia Museum of Art’s retrospective show of the beloved artist who began taking pictures of Philadelphia’s overlooked neighborhoods a decade ago — Strauss’s photos are displayed on 54 billboards across town. Similar to her previous public art initiatives (which take place annually under a South Philly Interstate highway), the billboards lack captions as well as any hint of pretension. Capturing American working class experiences through the loose themes of epic journeys and homecomings, their beauty lies in their availability, unadulterated subjects and massive size.