On my way in to work, the morning sky was a deep true blue with shadings into purple. The weather is very cold, and there were no clouds anywhere, but along the eastern sky there were four layers of con trail, all pretty much straight, and evenly spaced, one above the other. They were touched by the still invisible sun, from below, and were vivid shades of pink and tangerine. But as I approached them, I realized that the colors alternated. The bottom stripe was tangerine, the next one up was pink, the next one tangerine and the top one pink.
Now, what the hell? How is that possible? Was it a matter of depth, of distance from the earth, and it just happened that the stripes were arranged in that way? It looked very familiar, so it wasn't until I started trying to figure it out that I boggled. They looked all to be roughly the same size, and they all came from the same airport -- so what is the answer here? Anybody?