Why Is The Sky Blue?

The sky is blue because molecules in the air scatter blue light from the sun more than they scatter other colours of the visible spectrum. At sunset, the light path is so long through the atmosphere that red is the stronger colour.
Antonio Gramsci put forward the idea that the values of a ruling class come to be seen as the norm. That over time, these values become accepted as normal and, as a result, people are born into a society in which they do not question the status quo but adopt these values even if they cause conflict within themselves.
But normal doesn't mean natural. The colour of the sky is only the colour we see.