I have found a very interesting website that introduces some kind of invisible technoloy project they are working on. A professor at the University of Tokyo has created an optical camouflage system that makes anyone wearing a special reflective material seem to disappear. Here are some real-life videos that show how this technology works. You need to see it to believe it, man. It's unbelievable.
http://www.star.t.u-tokyo.ac.jp/projects/MEDIA/xv/images/mirror.mpg
http://www.star.t.u-tokyo.ac.jp/projects/MEDIA/xv/images/oc-s.mpg
http://www.star.t.u-tokyo.ac.jp/projects/MEDIA/xv/images/oc-okugai3.mpg
http://www.star.t.u-tokyo.ac.jp/projects/MEDIA/xv/images/bone2.mpg
The TIME magazine has chosen "Invisible Technology" using
Retro-reflective Projection Technology (RPT) as one of the coolest
inventions made in the year 2003.
If you guys want to know more about it, go visit their offical website.
http://www.star.t.u-tokyo.ac.jp