You may have heard about "dos-à-dos" (back to back) book bindings that

You may have heard about "dos-à-dos" (back to back) book bindings that make one book turn into two, but this is mind blowing!

A 16th-century book that contains no fewer than six different books in a single binding. They are all devotional texts printed in Germany during the 1550s and 1570s (including Martin Luther, Der kleine Catechismus) and each one is closed with its own tiny clasp.

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This is such exquisite craftsmanship. Even not considering the clasps and folds, it’s just so breathtaking. You can view it in more detail on the National Library of Sweden’s Flicker stream.