A cloaking device from off-the-shelf superconductors and magnetic tape
This artist’s depiction shows how to make a magnetic cloaking device. Ferromagnetic materials attract magnetic fields (left), while superconductors expel magnetic fields (middle). Combining the two in a particular way cancels out the individual effects, l
The dream of turning solid objects invisible is an ancient one. In recent years a number of experiments have succeeded in "cloaking" (to borrow a term from Star Trek) specialized materials, rendering them transparent to some wavelengths of light. True invisibility, however, remains in the realm of science fiction. The challenge is to create conditions in which electromagnetic fields are the same on both sides of a solid object, meaning that the presence of that object is masked.