Interesting article published in Nature about tunnelling magnetic fields from point A to point B whilst being, in effect, invisible to an observer between A and B.
Sci-Fi wormhole technology for magnets. Very cool!
http://www.nature.com/articles/srep12488
(http://www.nature.com/article-assets/npg/srep/2015/150820/srep12488/images_hires/m685/srep12488-f1.jpg)