Monday Thoughts

It snowed. It snowed all yesterday and never emptied the sky, although the clouds looked so low and heavy they might drop all at once with a thud. The light is diffuse and hueless, like the light on paper inside a pewter bowl. The snow looks light and the sky dark, but in fact the sky is lighter than the snow. Obviously the thing illuminated cannot be lighter than its illuminator. The classical demonstration of this point involves simply laying a mirror flat on the snow so that it reflects in its surface the sky, and comparing by sight this value to that of the snow. This is all very well, even conclusive, but the illusion persists. The dark is overhead and the light at my feet; I’m walking upside-down in the sky.   ~ Annie Dillard, Pilgrim at Tinker Creek