The Overstory

by Richard Powers

Every large living thing is a latecomer, showing up after dark. Nine p.m. brings jellyfish and worms. Later that hour comes the breakout—backbones, cartilage, an explosion of body forms. From one instant to the next, countless new stems and twigs in the spreading crown burst open and run. Plants make it up on land just before ten. Then insects, who instantly take to the air. Moments later, tetrapods crawl up from the tidal muck, carrying around on their skin and in their guts whole worlds of earlier creatures. By eleven, dinosaurs have shot their bolt, leaving the mammals and birds in charge for an hour. Somewhere in that last sixty minutes, high up in the phylogenetic canopy, life grows aware. Creatures start to speculate. Animals start teaching their children about the past and the future. Animals learn to hold rituals. Anatomically modern man shows up four seconds before midnight. The first cave paintings appear three seconds later. And in a thousandth of a click of the second hand, life solves the mystery of DNA and starts to map the tree of life itself. By midnight, most of the globe is converted to row crops for the care and feeding of one species. And that’s when the tree of life becomes something else again. That’s when the giant trunk starts to teeter.