| And as the
show goes on, the light of day begins to wane. We watch. As the sun wanes,
we enter an eerie world, where nothing looks right-- our faces, the trees
around us, the birds flying past, the swift river, all shine with a pale
silver glow, and details stand out in sharp relief. It's not like dusk at
all-- the sunlight is slowly weakening, becoming watery and thin, like a
stream of water from a tap that's slowly being turned off.
Suddenly, waves of light and shadow begin to wash over
the ground--- undulations of light called shadow bands, cast by light
passing through the earth's atmosphere, like the ripples of light at
the bottom of a swimming pool.