a figure of speech by which a part is put for the whole (as fifty sail for fifty ships), the whole for a part (as society for high society), the species for the genus (as cutthroat for assassin), the genus for the species (as a creature for a man), or the name of the material for the thing made (as boards for stage)
In this regard, the PowerPoint chapter, “Great Rock and Roll Pauses,” works as a synecdoche for the entire novel, where gaps, pauses, and strict formatting rules define each slide.