Optical correlators, meanwhile, work by encoding images on to a beam of light and, using a special lens, transforming them into their Fourier components building-blocks that encode the thickness and direction of lines in the image, but not their position.

ECONOMIST: Optical recognition

Netanyahu's envoy's position should be the mirror image of Obama's Middle East envoy George Mitchell's role.

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When the result is transformed back into its original condition, the only light remaining marks the position of the target, or things that looked similar to it, in the original image.

ECONOMIST: Optical recognition

The capability to also adjust the audio settings of Parrot Zikmu Solo according to the size of the room (room size compensation) and the position of the speaker in the room (room position compensation) contributes to this balanced sound image.

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It can also identify and monitor the position of the eyes, so it knows exactly where each image needs to be beamed, and passes this information on to the holographic-projection system.

ECONOMIST: Monitor

Unless Mr Hague can improve his image, he is in danger of reaching the position that whatever he says or does is interpreted through twit-tinted spectacles.

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One thing's clear, however: The artist purposely chose to position each image above a protruding ridgeline that runs along the cave wall, symbolizing either the surface of the water or tall grass that's obscuring the lower half of the deer.

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President Kuchma's opponents allege that he has used his position to project a favourable image of himself and undermine his opponents on state television, particularly the first programme.

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He blamed "tax write offs" and a "review of image right payments" and went on to claim other Super League clubs were in the same position.

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