I don’t see a WordPress shareable link, so I’ll post an excerpt from Colossal:
“…Printed in the late 16th century this small book from the National Library of Sweden is an example of sixfold dos-à-dos binding, where six books are conjoined into a single publication but can be read individually with the help of six perfectly placed clasps. This particular book was printed in Germany and like almost all books at the time is a religious devotional text.”
Special thanks to Erik Kwakkel for the original story.
Pic: Stockholm, Royal Library. See the full image gallery here.