The ferromagnet attracts magnetic field lines, the superconductor repels magnetic field lines and the superconductor ferromagnetic bilayer cloaks a magnetic field. An object inside the cloak would be magnetically undetectable. This video is narrated in Spanish by co-author Jordi Prat-Camps. This video relates to a paper that appeared in the March 23, 2012, issue of Science, published by AAAS. The paper, by F. Gömöry at the Slovak Academy of Sciences in Bratislava, Slovakia, and colleagues was titled, "Experimental Realization of a Magnetic Cloak."