The word 'eunoia, ' which literally means 'beautiful thinking, ' is the shortest word in English that contains all five vowels. Directly inspired by the Oulipo (l'Ouvroir de Litt rature Potentielle), a French writers' group interested in experimenting with different forms of literary constraint, Eunoia is a five-chapter book in which each chapter is a univocal lipogram - the first chapter has A as its only vowel, the second chapter E, etc...