Spectral traces back to the Latin word spectrum, meaning an "appearance, image, or apparition".  This is rooted in the Latin verb specere, meaning "to look at or view".  Evolved into the Latin spectrum (a vision or ghostly afterimage), which lent itself to the English noun specter (a frightening ghost).  Added the suffix -al (meaning "of" or "pertaining to") in the early 18th century to form the adjective spectral.  

The spectral (or ghostly/uncanny) in storytelling is a powerful tool for exploring the return of the repressed —giving physical, lingering form to unresolved trauma, silenced histories, or forgotten pasts. It bypasses cold facts, engaging the audience's emotional core to make complex psychological and cultural tensions universally relatable. 

Representing Trauma and Memory: Specters often serve as literal or metaphorical manifestations of the past that refuse to remain buried. 
Historical Reckoning: In literature like Toni Morrison’s Beloved, the ghost of an enslaved child personifies the visceral, generational trauma of slavery that a community tries to suppress.
The Uncanny: Rather than pure supernatural horror, the spectral is used to make the "familiar unfamiliar," forcing characters to confront truths they have been ignoring about themselves or their environments. 

Representing Linear Time: Storytelling that features ghosts or hauntings rejects the idea that time is a straight line. 
1. By bringing the past into the present, spectral narratives allow characters to negotiate with regret, lost futures, and the enduring echoes of their choices. 
2. This allows authors to show how the foundations of the present are built upon the erased, invisible, or silenced stories of those who came before. 

A Vehicle for Empathy and Connection: Storytelling, by its very neurological nature, is a shortcut to empathy. Introducing spectral or unexplainable elements suspends the audience's everyday disbelief, allowing them to engage with abstract human emotions in tangible, moving ways. Because ghosts do not belong entirely to the living or the dead, they act as an effective bridge for audiences to step into another person's subjective reality. 

Exploring the Boundaries of Reality: The spectral metaphor naturally opens up room for postmodern experimentation, magical realism, and cultural critique. By bringing marginalized or "invisible" experiences to the forefront, it gives power to those without a voice and challenges negative, one-sided stereotypes.