This book contains a hidden painting of London.
An easter egg is the name for something hidden inside a computer game, program or movie which can be discovered if you know the secret – such as a combination of keystrokes or other actions.
Yet the concept of something hiding inside media is not new. In what’s called a hidden fore-edge painting, whose earliest example is a Bible from 1651, entire paintings were hidden within the edges of the pages of books.
An artist would fan out the book’s pages and clamp them down, and then paint an image on the fanned-out edges. Then the artist would close the book and cover the edges in gilt to hide the painting. (If the edges were not covered in gilt, you’d see a squashed version of the original painting on the edges.)
When a reader read the book, he or she would very likely not notice that every page contained a thin slice of a painting. But when the pages were fanned out…
Some books contained more than one image, depending on which three edges of the book were painted, and which side the painting was painted on. Theoretically, then, a book could contain six hidden images.
These paintings weren’t always part of the original printing and binding of the books. In the late 1800s, book owner John T. Beer decided that many volumes in his collection of books needed something a bit extra, so he painted hundreds of their edges.
Do you have lots of books? It’s time to get to work!
In this clip from the National Library of New Zealand, a nineteenth-century fore-edge painting of London is shown on the edges of Milton’s "Paradise Lost".
A fascinating art
More examples here: Secret Fore-Edge Paintings Revealed in Early 19th Century Books at the University of Iowa, Colossal>>
– Fore-edge painting at Wilipedia>>
– A Collector’s Primer to the Wonders of Fore-edge Painting, International League of Antiquarian Booksellers>>
– Fore-edge paintings, Folger Collation>>