“Yours affectionately,
“Pia.”
To which Trix replied:
“My dear Pia,
“My rainbow shines after every shower, and is brightest against the darkest clouds. When I look towards the darkest clouds I wait for the rainbow.
“Yours,
“Trix.”
And Pia wrote:
“My dear Trix,
“What happens when there is no longer any sun to form a rainbow?