I quickly added a few words in the wiki about Sketch, Knot and VonKoch.
Please feel free to review and eventually translate to decent english ;-).

btw: I remember I had some remarks about the name of the "knot" effect. Does it sound correct?
Would "over-under" be more evocative? Any suggestion?

I also have 2-3 more questions about lpes:

-Is there a way to hide/show knotholder/helper paths on demand --- at the moment, I through them far away off the page :-(
-Is there a way to have arbitrary and dynamically varrying number of knotholders? I would like to have one per crossing...
-An alternative would be to replace them by a path, with a function called whenever a point is clicked. Is this possible?