Success! I managed to create the path effect myself. Attached (at the bottom of this post) you will find a ZIP file with the two files that need to be placed in the /Share/Extensions/ directory. Then, after Inkscape has been (re)started, "Inside Out" should appear in the "Modify Path&...

Aaaahh, thanks for your advise! I have looked around, and although I am neither familiar with python, surely I should be able to figure it out. If I get it working, I will post the code

Yes, I see that there is a problem. On one side, there is the `outside' in (A) that does not actually exist in terms of a `dedicated' path, whilst it should be represented by a path in (C). Vice versa, as you correctly pointed out, the `inside path' should be turned outside, which will need addition...

Thanks for your comment! Yes, you are right; there seems no functionality at hand that will make this very easy. I was not expecting on-click-and-you're-done, but maybe with some smart trick make it possible. I tried for example the perspective tool, in combination with the Flip Horizontal. Then, on...

I am writing a mathematics thesis involving a lot of inkscape graphics. Currently, I am stuck, as I need a very special type of transformation of a (so-called) planar graph. As show in the picture below, I have created 4 paths (A). Now, I would like to `push' (B) the outermost 3 paths into the inner...