JF Ptak Science Books
The moveable book (flapbook) has long been interesting to me--unfortunate though that in my own fields they weren't used very often. There are some very notable exceptions--early geometries would occasionally be published with many of the geometric illustrations made to pull out a little with the tug of a string to show you the construction in 3-D. Then of course there are the paper dissection manikins, where you can find nearly-life-sized paper anatomies with hundreds of movable/liftable flaps, and smaller examples of the body and specific organs that can be simple or not simple whatsoever. These were time-intensive efforts, and in their own way they provided a sort of pre-MRI MRI by revealing the various layers of 3-D objects with 2-D tools--and they're beautiful and captivating objects.
- This plate appears in Der Maschinenbau. Modelle.Zeichenerklärungen zu den Modellen des Werkes, by R. Georg, printed by Heinrich Killinger in Nordhausen in 1925. The major detraction here is an old 5-inch tear that has been repaired verso with acid-free tape, otherwise in nice condition. 8.5 x 12.5", with 7 moving flaps. $100
The full image, unmoved: