There are a number of reasons why the remarkable photographs by Graciela Iturbide probably would not be used in an advertising campaign to lure tourists to Mexico. She works primarily in black and white, and neither the landscapes nor the people in her work appear to be particularly genteel.  On the contrary, her powerful images tend to rattle and put you on guard, as if you had stumbled into a not yet explored physical and emotional territory connected to the ancient past...