After a debauch of thunder-shower, the weather takes the pledge and signs it with a rainbow.

The beauty of rainbows consists also in their ephemeral nature.
Johann Wolfgang von Goethe, who knew what he meant, said that after fifteen minutes nobody looks at a rainbow anymore.

Maybe the flaw is not in the rainbow, but in us, we, capricious human beings who often start finding monotonous everything that is regular part of our life, as if something new was necessarily better.