This was a once-in-a-lifetime experience. My brother, who is a hobby astronomer, called me and sent me outside. Initially, I saw only a faint red glow in the northeast of the sky, but after a few minutes, my eyes adapted and I could see how it slowly moved and changed its form over time. I stayed outside for maybe 15 minutes and then went back inside. An hour later, I went outside again and almost the whole sky was shining in all different colors and forms, from patches to clouds to pillars that seemed to support the heavens, ever chaning. Incredible.