To retrieve the past is no great effort, when the events to be recalled are so firmly imprinted on the mind. It is existence in the present, the bleak wreckage and residue of what has gone before, that is so burdensome.

And if I were to open you up - would you see anything less remarkable? Less intricately dazzling, in its squelching, spongy way? Lungs and heart and spleen, and all the rest - ticking away, as it were? Yet you walk down the boulevard, and pass any number of such wonderful devices, all ticking away as they walk, and think it no great marvel.