A pillow book is a collection of notebooks or notes which have been collated to show a period of someone or something's life, in the case of Cordelia Kenn, it showed her life and thoughts so that her daughter could relive her past.
A pillow book is a collection of notebooks or notes which have been collated to show a period of someone or something's life. In the case of the fictional character Cordelia Kenn, it shows her life and thoughts so that her daughter can relive her past.