I really enjoy DeLillo's delinearization of time in Underworld. It seems that he embraces a cyclical vision of history in which the past and future depend on each other. In this vision, the traditionally distinct beginning and end really stand for a single arbitrary point along the circle depending on one's frame of reference. The book seems to function much like a human memory which patches together discrete frames of stopped time which influences what will happen, yet at the same time, what happens will influence the collection, arrangement and interpretation of memory such that the two become inexorably intertwined.