I love puzzles, all kind of it.
So a long time ago I read a book, Perfect Harmony, in which the girl plays with secret boxes that doesn’t have any aperture, and you have to make some movements to open it.
A few years ago I searched in Google and I found them!; they are called Karakuri Boxes and there’s a world of them.
I have a few…
This is Karakuri Box nº 7
Karakuri Box nº 5
Karakuri Box nº 2