Over the noise of the radio I could discern the sudden awakening of a flock of geese, yet I couldn't see a single goose in the sky. I pulled my car over to the side of the road and got out just as the flock emerged from the river across the road. Dozens of them circled and swooped in the air, like a swirling current. Within a few seconds of their dramatic entrance the flock was gone, destined for warmer weather and more food availability. I sat in silence for a minute, moved by the power, grace and unity of the life I'd just witnessed.