Books can be packed full of inspiration - from the content itself to the striking illustrations, flicking through the pages is always a pleasant experience. But what if the inspiration fell off the pages and onto the book's edge?
While going through the Special Collections & University Archives (opens in new tab)at the University of Iowa, Colleen Theisen (opens in new tab) noticed that there was a painting concealed on the edges of a book’s pages. Called 'fore-edge paintings', the images only reveal themselves when a book’s pages are spread out.
The paintings appear on a series of books by Robert Mudie (opens in new tab), titled 'Autumn', 'Winter', 'Spring' and 'Summer'. Some books even contain a second image once the book is flipped over!
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What do you make of these secret paintings? Let us know in the comments box below!