Book from 16th century bound so that it can be opened in six different ways

The binding sturcture is called dos-à-dos binding. This variation of a dos-à-dos binding format allows the resulting volume to be opened in six different ways, each way revealing a different book. The book features devotional texts printed in Germany, including Martin Luther’s Der kleine Catechismus. The volume is from the late 16th century and comes from the Rogge Library in Strängnäs, Sweden. All photos ©István Borbás/National Library of Sweden.
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