Swedish engineers are working on a tank that will be able to blend into the background -- whatever that background may be. It's covered with a skin that can change its appearance:
http://news.sky.com/home/technology/article/16063257 -via Ace of Spades HQ | Photo (unrelated) via Flickr user Håkan Dahlström used under Creative Commons license
The technology is based on sheets of hexagonal 'pixels' that are able to change temperature very quickly.
On-board cameras collect images of the vehicle's background and display that infra-red image onto the vehicle panels, making it appear to vanish.
http://news.sky.com/home/technology/article/16063257 -via Ace of Spades HQ | Photo (unrelated) via Flickr user Håkan Dahlström used under Creative Commons license
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