"Why does the sun down?"

A day of working from home because I had an appointment with the dentist for a filling (probably the one that was cancelled by the COVID lockdown) and, as my -NHS- dentist is still near Mom & Dad's I paid them a visit and did some work from their home.

On my way home I stopped off at the farm to pick Owen up. As we were finally leaving for home we were greeted by the sun setting fire to the sky as it dipped below the tree, and Owen asked the question, "Why does the sun down?"