Eunoia is the shortest word in the English language that contains all of the regular vowels. It means beautiful thing, which this collection is. It is divided into five chapters, each one containing only words that consist of one of the vowels. So chapter one has only "A"s, chapter two "E"s and so forth and so on. It is also coherent and readable, quite an achievement for a "gimmick" book.
Worth picking up.