These funny stories in verse and prose are written in the name of error, but which one? Gianni Rodari was convinced that “the errors are not in the words, but in the things; that dictations must be corrected, but above all that the world must be corrected”. Distracted students, a meticulous teacher, quaint city dwellers and curious peasants do not care about spelling in the same way... however, the most important thing is not to cry fault but to understand its reason and having fun. This book takes us into a disordered but logical linguistic universe, frantic but with a purpose, unleashed with good reason. Rodari teaches us his grammar of the imagination to master our language "not so that we are all artists, but so that no one is a slave". Published in 1964, this is one of the most emblematic books by cult author Gianni Rodari and the first to be illustrated by Bruno Munari. It is the beginning of a rare complicity and a long collaboration between the two masters. Bruno Munari is a mythical figure in the world of art and design of this exceptionally creative period that were the years 1960-1970 in Italy. Masters of the imagination and promoters of educational methods based on play and invention, Munari and Rodari were and still are one of the most famous and admired creative duos.