Karakuri Boxes

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


And this is my last adquisition I don't know how to open it yet... but I'm sure I'll find it soon!


Karakuri Box nº 6
                                                       

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