Rainbow

Rainbow is a physical thing.
Once when I was in about 7^th form in school I found out that rainbows can happen not only after the rain but with the help of the mirrors as well.

I still remember when we saw a rainbow out of the window. It was big, but we saw from where it was going. And we made some photos, which are still somewhere on hard disk. Just imagine: cooling-towers behind the concrete fence on the right, a few people walking with dogs and children on the left, trees in the background with some yellow constructions, bluish gray sky and - the rainbow. Very good photo, I should say.