Aw... such a cute litte book (book? maybe a secret framed scene inside what looks like a tiny book?)
This is a laser-cut set of 4 chipboard pieces. One piece is scored to be the inside "framed scene." That mini box (with a rounded-corner window already cut out) gets glued onto the back cover of the 3 pieces that form the outside of the book (front cover, spine and back cover).
See the Matchbox Sized Faux Book Box page for photos of how this wrap-around cover works.
Two of the photos show a sample made by Teri Calia (with washi tape used to hinge the covers to the spine). More info in the blog and/or see the supply list.
1-3/4" tall x 1-3/8" wide (when closed)