You just never know what you'll find in those boxes of memorabilia. I just got this from the wife of an old friend of Howard's (like the kind of old friend you shared a playpen with). It's something Howard wrote, dated June 1956 from Miss Carter's Country Day School:
What I Like To Do For My Daddy
Sometimes I put on puppet shows for my father.
One time I put on one that is about a little boy and a two-wheel bike.
Sometimes I put on Peter Pan, which he likes very much.
He said he is going to make me a stage with a real wooden frame that you can put staging on.
Already, he was thinking about the staging.