I came upon a very unlikely location for a wall while walking down Drury Street, one of those very short and narrow streets in Center City Philadelphia.  This is an unlikely place for wall art.  Over time several layers had been intermixed, but this wall is special because all the layers are in black and white; thus the entire photo set is in black and white.  It makes for a very different effect than when you have black and white intermixed with color. - Michael Spewak