Scientists from the University of Rochester figured out this relatively low-tech solution. The lenses bend light in a way that creates a blind spot between them, curving light rays around a ruler, hand, or some other small object, rendering it invisible when viewed through their aperture.

How do you think invisibility technologies work?

The device works by shifting one frequency of light to another as the light passes through the object. Once it has passed, the frequency is put back in its original state. This way, the light passes through the object but does not interact with it at all, making the object invisible to an observer.

Is invisibility tech possible?

The good news is that the new research confirms that invisibility is indeed possible. ... These facts combine to mean that while we can make something like an antennae or military radar invisible to radio waves, it is nearly impossible to cloak something the size of Harry Potter from the naked eye.