conventional versus the unconventional

This story is confusing. It is confusing because of the controversial and nonsense tales that the substitute, Miss Ferenczi, tells. Conventional means, in a sense, that it is normal or generally accepted, so i guess her stories are considered such. How such unconventional stories combines with the conventional would be picking at straws, however there is a sense of connection between her generally unacceptable stories to the generally accepted minds of youngsters. for instance, people accept that young kids have good imagination, but do not accept that gryphons exist, yet here the two mix. more to the point it is the 6x11=68 debacle that truly signifies this relationship of her stories to child mentality.
there is also a sense that the unconventional is fleeting and brief. this is viewed as Miss Ferenczi only being a substitute teacher, only a brief replacement whereas Mr Hibler is the actual teacher and even at the end it goes from the fantastical back to the norm, "when Mr. Hibler would certainly return and test us on our knowledge" (56 Baxter).