A closed sink is an inversion of a point, but in such a way that it is not possible to open the point flat while performing the maneuver. This makes closed sinks extremely hard to perform. In fact, from a strictly mathematical viewpoint, it is impossible to perform a closed sink using a finite number of folds (and what is impossible in mathematics is usually pretty hard in reality).
omzig89 wrote:and see how the tip squashes open, but not all the way?
For a closed sink, do the squash all the way and push it inside.
omzig89 wrote:Also, you must have diagrams for something with pictures, so, combine the wonderful advice of all the people who posted here and your diagrams. Happy folding!
wolf wrote:Doesn't that just give you an open sink?
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