Constructed from a novel “Focus” has a girls side and a boys side indicated by the tag on the glass fuse.
If you look at the detail you will see that the text viewed through the glass is clear on the boys side but blurry on girls side.
The girls side is dressed in lace while the boys side is plainer.
All books in this series are first steeped in beeswax to permeate the layers and encapsulate in wax. I believe this helps in the preservation.