Shadow is the blue patch where the light doesn't hit. It is mystery itself, and mystery is the ancients' ultima Thule, the modern explorer's Point of Relative Inaccessibility, that boreal point most distant from all known lands. There the twin oceans of beauty and horror meet. The great glaciers are calving. Ice that sifted to earth as snow in the time of Christ shears from the pack with a roar and crumbles to water. It could be that our instruments have not looked deeply enough. The RNA deep in the mantis's jaw is a beautiful ribbon. Did the crawling Polyphemus moth have in its watery heart one cell, and in that cell one special molecule, and that molecule one hydrogen atom, and round that atom's nucleus one wild, distant electron that split showed a forest, swaying?