Invisibility !!!

Invisibility!!! Isnt that a strange feeling? I have seen magicians making things invisible in front of huge audience. Still I dont know how they do that. But anyways, its really terrific to feel that something's there before us which is invisible. When I was small, I used to think how cool it would be if I could become invisible according to my wish. When I play Quake 3 Arena, I can get the 'Invisibility' power, after which I can shoot my enemies without letting them know where I am :) . So, thats really amazing; but very less practical in our real life.

I believe invisibilty would be just fooling a human eye in practice. I have seen a video (forwarded through e-mail by some of my friend), in which a Japanese guy wears a coat which makes his body invisible. The idea behind the 'Invisibility coat' was keeping realtime camera's and displaying video in the coat to cover 180 degrees from both sides. It continuously captures video from the one side, and displays on the other side. Hence the thickness of the object to be made invisible doesnt matter here.

Now, I was thinking it in another way. We see objects because, light falls on it and the way it reflects. Another thing is that visible light does not penetrate through opaque objects. Penetration of visible light makes it 'Transparent', if 100% transparent then 'invisible'. But there are others in the electromagnetic spectrum, like Infrared, radio waves etc which we use widely and has the power of 'penetrating' through opaque objects. In other means most of the objects in the world are not 'opaque' with respect to these electromagnetic waves. If there can be some easy way of converting visible light to say IR, and converting back to visible light without any loss/degradation, we can easily make things invisible. Again, I am not sure of the practical issues in doing this. This is just another thought.