The possibility of becoming invisible has been one of the desires of human beings since time immemorial. A dream reflected in countless books, series and films. The Canadian company Hyperstealth Society is about to make it a reality. Has developped a shield of invisibility that hides any object or person placed behind it.

Hyperstealth is one of the expert camouflage companies The most important in the world. His designs have been used on more than 6 million military uniforms. But Qualtum Stealth, his shield of invisibility, is at another level, because it does not camouflage a person, that is, it does not confuse him with the environment, but directly makes it invisible.

As we can see in the opening photo or in the following video, the effect is not perfect, but it is spectacular. In the image above we see how the body of the person carrying the shield disappears from the waist up, and yet we can see what is behind him: the window frame and the glass. In this video you can see many other even more impressive examples. It doesn't let you play it outside of YouTube, but by tapping on it you can watch it from the original location:

Even if the effect is not perfect, the invisibility shield is not completely transparent, it nevertheless fulfills its function of hide an object or person, while showing what is hidden behind the object. So that really makes him invisible. This can be very important in the context of a military operation or to preserve privacy.

The most interesting thing is that It is inexpensive to manufacture and requires no energyso it's completely portable.

How does this invisibility shield work? In fact, the science behind it is very well known, as it is based on the classical model lenticular lenses. You have probably already seen the 3D effect of some book covers, or some DVD or Blu-ray movie covers, which generate a 3D image if you look at it from the front, and it becomes flat if you see it from the side. Hyperstealth uses this optical effect to hide objects.

This invisibility shield changes the light according to the settings of the Snell's law, which calculates the angle of refraction of light when passing through the separation surface between two media. Every object has an index of refraction of light, and we see it differently if the light passes through air or another medium such as water. This is an easy effect to verify: If you put a spoon in a glass full of water, you see the spoon bent. In addition, its shape changes depending on where you look from.

Hyperstealth took advantage of all these concepts to create a material that bends light and allows us to create Blind spots a certain distance from the invisibility shield. As seen in the video, the shield allows you to see what is near and what is far, but not what is at medium distance (the object to be hidden). It's not perfect because it blurs the backgrounds, but it can be annoying if you don't know there's something there or aren't paying attention.

At the moment, there is no information on a possible commercialization of this technology, although it is very likely that it will only be used in the military environment.

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