AT A LONDON POETRY FESTIVAL Jacob's Ladder: six-winged seraphim scramble up the receding beam, as cherubim tumble, po-faced, spent; while underneath: angel ordinaries, content to browse the falling feathers, gossip over light motes — some looking up, some never looking up, until Tomas Tranströmer, laureate, at the piano, fingers the sarabande written for his only good hand, smiling mutely from his rolling chair at the standing adoration tendered there.