This article is cross-posted from KnightArts.org. Photos by Steve Weinik for the City of Philadelphia Mural Arts Program. More pics on Flickr. The railroad corridor between New York’s Penn Station and Philadelphia’s 30th Street Station is well traveled with some 34,000 passengers daily. Typically there’s not much to look at, and riders sit immersed in laptops, newspapers or naps. But a striking new addition to the landscape is giving them a good reason to glance out the window: Intermingled with the graffiti, junk heaps and weedy slopes is a sequence of seven “murals,” together titled “psychylustro,” by the German artist Katharina Grosse. Vibrant orange intercut with white diagonal stripes covers the facade of a multistory building, while a shocking pink coats a tattered fence, bare trees and even the grassy ground of a hill. Another section of earth is saturated with a distinctly unnatural green. The overall effect is as if Mark Rothko had gone on an outdoor acid trip while toting a giant spray gun filled with Day-Glo paint.