Is it possible to reach the end of a rainbow?
a) Yes. As long as it rains, it is possible to go to the end of a rainbow. Unfortunately no gold is hidden there.
b) It depends. When it rains too much, the rainbow is so big that there is no end.
c) It depends. When the sun shines too brightly, the rainbow fades before you can reach it.
d) No. The observation of a rainbow depends on the position of the beholder, therefore the rainbow moves along with the observer.
