A well-known natural spectacle is the rainbow, a very colorful stripe that is always curved when viewed from the earth. If the canton of Nidwalden, seen from Lucerne, comes into a “wash cycle” (heavy rain), this spectacle is frightening for those “inside” and a natural spectacle for those who look from the outside.
Why is there a rainbow? Who puts the color in the rainbow? Why is the rainbow always bent? Who always arranges these colors in the same order? Under what conditions are the colors reversed in a rainbow?
For detailed information see: https://www.youtube.com/watch?v=6tOKvj8Qo74