While out driving one winter evening, the sun was setting below a distant horizon that I couldn’t see. Trees lined the sides of the road and, while creating not exactly a tunnel, they blocked the actual view of the orb itself. The day had been partly sunny with cloud forms shifting between layers of the atmosphere. Even though I had studied weather pretty intensely for a number of years, I couldn’t readily identify the cloud types. Thin, smooth lengths of cloud seemed to be suddenly rising up into cumulus banks, heavy with snow. Not far away, the sky was clear. As the sun was going down, these dramatic clouds were lit with the colors of fire: yellows, oranges, and reds. Further to the west, a high, broken bank of clouds glowed a rosy red against a twilight sky. Since the highway we were on was straight, I had a fairly consistent view of the warm tones of the sun highlighting the impressive clouds. My camera couldn’t hope to catch the intensity of the palette revealed to my eyes. When the sun finally fell beyond the range of the clouds, they appeared gray and prosaic against a darkening sky. They had been alight only moments ago, and now they were dull, and not even white.

What I’d learned of physics reminded me that even these colors were not inherent to the clouds—colors are simply reflections of light rays and the range that we see depends on our eyes. An object’s color, in other words, is a kind of illusion. It’s an illusion we share, and although some people are color-blind, we make the conventions of color part of everyday life. Red means stop, and green mean go, for example. Objective reality is simply the fact that objects reflect different wavelengths of color. Depending on the light source, they appear a specific color to us. While we take colors for granted, they are actually a way of conveying meaning that isn’t entirely real.

Ancient people looking at the colors in the sky could only understand them as caused by the activity of the gods. Bright hues in the clouds suddenly diminished to gray could be the basis for a myth of heavenly conflict. A rainbow, according to Genesis, is a sign that such a conflict is finally over. I don’t know what the gods might have been doing overhead that night, but as the sun disappeared and a full moon rose, throwing soft, but pervasive light from the broken clouds that have only moments before had appeared red, another reality seemed to be taking over. I suspect that we have lost much by no longer watching the sky. My daily work generally involves sitting in a windowless room, and in Midtown the sky is occluded with human attempts to climb to heaven. When I can see the sky for an extended period of time, it seems that the gods are putting on a show, if only we’d watch.