'Magic and scent were conceptually linked in antiquity. Ancient authors sometimes treated magic as a type of smell; at other times odors were treated as a medium through which magic worked. Some authors compare the effect of smells to magic; others described scent and magic as different things but impossible to distinguish. Magicians used incenses and perfumes liberally to set the scene for their rituals and please the gods, as demonstrated by the corpus of spell books that survive from Greco-Roman Egypt; meanwhile, ancient deities signaled their presence by their divine fragrance.' So writes Britta Ager in her academic paper for Penn State University, Magic Perfumes and Deadly Herbs: The Scent of Witches' Magic in Classical Literature.