Difference between a double sink and a unsink fold?

[Gerardo]

I'm confused about the double sink and the unsink folds. I've only found written explanations of both but I don't get them. They sound to me like the same thing.

I would really appreciate it if someone provides images so I can understand both folds

Thank you!

[Baltorigamist]

A double sink, in a sense, includes an unsink--you sink the paper in and unsink it back out. An unsink, on the other hand, doesn't require you to sink the paper down first; it will already be done via previous manipulaitons of the paper.

[Gerardo]

A double sink, in a sense, includes an unsink--you sink the paper in and unsink it back out. An unsink, on the other hand, doesn't require you to sink the paper down first; it will already be done via previous manipulaitons of the paper.

That simple? In Wikipedia it sounds so complicated:

The open double sink is equivalent to making an open sink, and then open-sinking the point in the opposite direction. It is a sinked analog of the crimp fold. When made in a single step (after pre-creasing), it can be easier to make than a single open sink, because it does not require neatly reversing the point. The open double sink is used in many box-pleated models.

Unsink, or sometimes open unsink, makes a concave pocket convex without fully unfolding the paper, or the opposite of an open sink. It is more difficult than the closed unsink below because there is no internal flap to grab onto to help unsink the paper, so the paper must be opened out and the area to be unsunk is pushed out (to be convex) from inside the model and from behind. It is a common fold in Lang's insects.

[Baltorigamist]

I see it as simple--the writer of that article might have seen it as something complex.