Check out this exhibition of anatomical flap books being held at Duke University in North Carolina.
These stunning and incredibly detailed books have been produced for centuries as both teaching tools and society curiosities. The oldest specimen on display was made in 1530.
The online exhibition is well worth a look and includes videos of the books in action. You can even hear the paper crackle as the pages are turned and the flaps are lifted. Browse the links down the right hand side of the site and keep an eye out for the pregnant ladies in hats and gowns to protect their modesty.