/**
* @brief Creates a new PageTurnBookSpineEffect
* This is an assisting effect of PageTurnEffect to display a book spine on _static_ pages, and also to flip the image horizontally when needed.
/**
* @brief Creates a new PageTurnBookSpineEffect
* This is an assisting effect of PageTurnEffect to display a book spine on _static_ pages, and also to flip the image horizontally when needed.