Moving paper dolls

When assembling those dolls, what do they put into the joints to let them move?

Fedrigoni paper montains

Hina Aoyama cuts with scissors

Hina Aoyama cuts these with scissors.

Toilet paper masks by Fritz Junior Jacquet

I have been looking at all sorts of stuff, trying to get some ideas for my monomyth hero.

These are really cool! They are made from toilet paper by Fritz Junior Jacquet.