It was, improbably, the forerunner of our digital age: a French poem about a shipwreck published in 1897 that, with its mind-bending possibilities of being read up and down, backward and forward, even sideways, launched modernism. St phane Mallarm 's "One Toss of the Dice," a daring, twenty-page epic of ruin and recovery, provided an epochal "tipping point," defining the spirit of the age and anticipating radical thinkers of the twentieth century,...