'Invisibility cloak' uses lenses to bend light
A device called the Rochester Cloak uses an array of lenses to bend light, effectively rendering what is on the other side invisible to the eye.
One of the problems with the cloaking devices developed to date — and it’s a big one — is that they really only work if both the viewer and whatever is being cloaked remain still. This, of course, is not entirely practical, but a difficult problem to solve. For the first time, researchers have made a cloaking device that works multidirectionally in three dimensions — using no specialised equipment, but four standard lenses.
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The Marx Brothers photographed in 1908 and 1931