Eunoia (2001) is an anthology of univocalics by Canadian poet Christian Bök. Each chapter is written using words limited to a single vowel, producing sentences like: "Hassan can, at a handclap, call a vassal at hand and ask that all staff plan a bacchanal". The author believes "his book proves that each vowel has its own personality, and demonstrates the flexibility of the English language." The work was inspired by the Oulipo group, which seeks to create works using constrained writing techniques.