What metaphors are used in The Long Dark Tea-time of the Soul by Douglas Adams?

The I Ching is an ancient Chinese system of fortune-telling. There is a series of hexagrams that are generated randomly through tossing certain objects. Each hexagram has a name and a symbolic meaning, which is supposed to point with wisdom to the best path. The meaning is expressed through a poem filled with metaphors. The fact that Dirk is using the I Ching as a pocket calculator is absurd and perfectly sums up the juxtaposition of ancient, foreign religions and philosophies, with modern technology and science.