This is not my hat is a 2012 childrens picture book by the author and illustrator jon klassen the story is told through the unreliable narration of a little fish who has stolen a hat from a big fish and how the big fish reacts to the theft. Jon klassen is the creator of the 2012 theodor seuss geisel honor book and new york times book review best illustrated childrens book of the year i want my hat backhe is also the illustrator of caroline stutsons cats night out winner of the prestigious governor generals award for illustrationjon klassen has worked as an illustrator for feature animated films music videos and . After i finished reading i want my hat back by jon klassen i was pleasantly surprised to learn that jon klassen wrote another book that had a similar theme to i want my hat back this is not my hat is a caldecott medal award winning book by jon klassen that also details the consequences of stealing and it i. This is not my hat by john klassen raises philosophical questions relating to stealing punishment lying and trust the main event in the book is a little fish stealing a big fishs hat while it is not explicitly stated the illustrations suggest that the big fish finds the little fish eats the little fish and takes back the hat. This is not my hat is a very popular and critically acclaimed childrens picture book published in 2012 by canadian author and illustrator jon klassenthe book is a follow up or better yet a spiritual sequel of sorts to a childrens book published just a year earlier by klassen titled i want my hat backwhile both books tell the story of a small animal who steals a hat from a