Where some see salt runoff and concrete, others spy the miraculous: an apparition resembling the Virgin Mary at the Kennedy Expressway underpass at Fullerton Avenue. The image drew crowds in 2005 after Obdulia Delgado, 31, spotted it while driving home from work at St. Elizabeth Hospital. It now draws out the mischief in graffiti taggers, who've traced faint eyes and a gaping mouth onto it as if mocking Munch's "The Scream." But behold an everyday miracle: A tidy shrine continues, adorned by lit candles, a mix of fresh and plastic flowers, a stick crucifix and memorial cards, including one to an infant "Born Aug. 11, 2007, At Rest Sept. 20, 2007." Chicago Archdiocese spokeswoman Dianne Dunagan sounded surprised to hear the spot still receives visitors: "I thought it was gone, frankly."