“I don’t post them”—shamefacedly.

“Oh, they are to an imaginary friend,” said Mrs. Benjamin, seizing an idea.

Isabelle nodded.

“That’s delightful. I used to have an imaginary companion, too. Is thine a girl?”

“No.”

Mrs. Benjamin ignored Isabelle’s uncommunicativeness.

“Why wouldn’t that be a good idea for the theme class, Isabelle? ‘Letters to an imaginary chum’?”

“Mine isn’t a chum.”

“Would thee care to tell me?”