The word palimpsest comes from the Latih palimpsestus, which originates from the Ancient Greek palimpsestos, meaning "scraped again".  Ancient Greeks and Romans wrote on reusable wax tablets or expensive parchment made from animal skins.  When they no longer needed the text, they scraped or washed the surface clean to write a new text on the same material, leaving faint traces of the original writing underneath.  Today, it also describes any object, place, or concept with multiple visible layers from different historical eras, such as an ancient city layout or a rewritten manuscript.  

A palimpsest in storytelling is a narrative structure where older, erased, or hidden layers of meaning, history, or previous texts remain faintly visible beneath the surface of a new story.   

Why Palimpsest Matters in Storytelling:  
Creates Depth and History: Just as a physical manuscript shows ghostly traces of past words, a palimpsestic story implies that a character, town, or culture has a deep, complex history that influences the present.  
Enables Intertextuality: Writers use the palimpsest framework to build upon, mock, or recontextualize older myths, classics, or historical events (such as James Joyce rewriting Homer's Odyssey).  
Represents Trauma and Memory: Characters and societies carry scars; a palimpsest structure visually or narratively shows how past griefs or historical events are never truly erased, but instead coexist with current realities. 
Engages the Audience: It invites readers to read between the lines, hunting for subtext, clues, and hidden motivations that linger just beneath the plot's top layer.  It contains unique works by Archimedes not found anywhere else, including The Method of Mechanical Theorems and Stomachion.  

Literary Metaphor and Theory:  
Intertextuality: Writers use the idea of a palimpsest to show how new stories are built on top of older ones. Every new book or poem contains hidden layers of past myths, allusions, and prior texts.  |
Gérard Genette: The influential French theorist explored this concept in his 1982 book Palimpsests, defining how a later text forces readers to remember or interact with an earlier text through parody, pastiche, or imitation.  
Layered storytelling: A modern novel or poem can function as a palimpsest when multiple timelines, character histories, or stylistic voices bleed through the primary narrative.  

Example Sentences Using Palimpsest:  
"The ancient city is an architectural palimpsest of old ruins and modern steel towers." 

"It is evident from the faint lines beneath the original text that scribes used the parchment over and over again as a palimpsest." 

"When viewed through history, the old neighborhood acts as a palimpsest where past eras remain visible under modern changes."

The most famous palimpsest is the Archimedes Palimpsest, a 13th-century Byzantine prayer book that hides erased 10th-century Greek copies of lost mathematical and physical treatises by the ancient Greek scholar Archimedes.  It overwrites a 1229 prayer book by a Christian monk named Johannes Myronas, scraped and washed the original parchment to reuse the scarce material.  Scientists used advanced imaging techniques, including X-ray fluorescence at particle accelerators, to read the hidden text underneath the prayers.  The manuscript is now kept at the Walters Art Museum in Baltimore, Maryland.  

A palimpsest in literature is a text ir surface that has been reused and overwritten, yet still retains faint, visible traces of its earliest layers.  

Just the facts:

PALIMPSEST Definition & Meaning - Merriam-Webster

Palimpsest | Word of the Day | Merriam-Webster

PALIMPSEST Synonyms & Antonyms - 22 words | Thesaurus.com

PALIMPSEST in Thesaurus: All Synonyms & Antonyms

Palimpsest Synonyms: 4 Synonyms and Antonyms for Palimpsest | YourDictionary.com

3 hours ago, drpaladin said:

Palimpsests were encountered more often back when paper was expensive and rare.

Also think of buildings or cities with a mixture of architectural and remodeling styles.  The first home I bought was built in the 1860s, and when removing layers of wallpaper there were many different styles, and one I remember looked more like it belonged on a wedding gift than the wall of a home.