Book which consists of chapters written using words limited to a single vowel. The title eunoia, which literally means good thinking, is a medical term which refers to the state of normal mental health, and is also the shortest word in the English language which contains all five vowels.
In the book's main part, each chapter used just a single vowel, producing sentences such as this: "Hassan can, at a handclap, call a vassal at hand and ask that all staff plan a bacchanal"
The cover of the book features a chromatic representation of Arthur Rimbaud's sonnet "Voyelles" (Vowels) in which each vowel is assigned a particular colour, and consonants appear grey.
It won the 2002 Canadian Griffin Poetry Prize and Canongate Books published a British edition in 2008.The book sold well in the UK making The Times list of the year's top 10 books and becoming the top-selling book of poetry in Britain.The author believes "his book proves that each vowel has its own personality, and demonstrates the flexibility of the English language."  

źródło opisu: wikipedia