British defense company BAE Systems has developed an 'invisibility cloak' that can effectively hide vehicles from view in the infra-red spectrum. The system uses a matrix of hexagonal pixels that can change their temperature very rapidly. On-board cameras sweep the area to pick up the background scenery and display that infra-red signature on the vehicle.
This allows even moving tanks to be effectively invisible in the infra-red spectrum, or mimic other objects. The tank skin essentially becomes a big infra red TV. The system can display anything you want on it - including a cow - while the rest of the vehicle blends into the background. The picture above shows a tank that looks like a cow.The Presurfer