Book excerpt: A collection of triptychs by acclaimed photographer Ed Kashi, which plays on the visual appetite of a hectic world. The triptychs span eras and continents, challenging notions of perspective and the possibility of singularity for any image. Contained in a format dating back to the Middle Ages, Kashi's images examine current issues of social and political significance, bringing together the joy, sorrow, destruction and reconstruction of a world in flux.