"Mistakes are necessary and useful, like bread. And sometimes even beautiful, like, for example, the Tower of Pisa.
In this book there are many mistakes. Some are visible to the naked eye; others are hidden, like in puzzles. Not all of them, however, were made by children—and that is quite understandable. Between us, adults, the world would be unimaginably beautiful if people only made mistakes, and only children! That’s why I dedicate this book for kids to dads and moms and, of course, to schoolteachers—everyone who bears a huge responsibility for correcting—without making any mistakes!—the smallest and most innocent errors that can happen on our planet."
Gianni Rodari