The real thing is sold on another page.
https://miniaturepopup.com/collections/miniature-pop-up-book/products/miniature-book-kit8
Contains two books for each of two books.
A [a Christmas Carol] 10x15x5mm
B [The Christmas Book] 16x20x4mm
C [a Christmas Carol] 21x25x5mm
D [HEURE ANTIQU] 24x32x4mm
Simple process just to fold.
The cardboard has already been cut.
Because it is offset printing, it will not be wet.
Aging is possible to soak in coffee.
Tools to prepare yourself
1. Cutter
2. Tools to attach a folding line
(Naildot pens, ballpoint pens that have stopped appearing, etc.)
3. Stick glue
4. ruler
5. Mat
6. toothpick
7. Pens, etc. (for aging processing)