Martin Parr describes his new book; Gerhard Steidl packs his suitcase; Ed Ruscha designs an ambitious artist's book; G nter Grass illustrates a new cover for The Tin Drum; Joel Sternfeld takes photos with his iPhone; Karl Lagerfeld walks the runway in Paris; Robert Adams rummages for vintage prints; Jeff Wall offers a tour of his new studio; John Cohen gives an impromptu concert; Robert Frank stumbles across a forgotten Polaroid.... For...