Experience is but a series of moments strung together across the web of time. Most go by unheeded, barely noticeable tremors through the lattice of personal chronology, but some, the truly momentous, are felt as wracking shudders that threaten all other moments. Such things can often be felt before they occur, a low tremble in the spine, a shift in the wind, a feeling. They are presaged, these moments; their coming is palpable