[A] variation on the dos-à-dos binding format (from the French meaning “back-to-back”). Here however, the book opens six different directions, each way revealing a different book.

The book, which comes from the Rogge Library in Strängnäs, features devotional texts printed in Germany during the 1550s and 1570s (including Martin Luther’s Der kleine Catechismus). Each of the books is held closed with its own ornate metal clasp.

Photos via National Library of Sweden.
Via Visual News.