He designed a fridge-magnet poem-kit (which, I believe, has now had a software program based on it). He wrote a skeptical book about Europe in 1987, before Europe was really a subject (Ach Europa! was the wonderful title of the original; Europe Europe in English). He wrote a children’s book, an opera libretto about a runaway Cuban slave, a world-best-selling math book (The Number Devil), a partial memoir (Tumult).