He could detect shallower water by colour, and see the light of invisible lagoons reflected in the undersides of clouds.

ECONOMIST: Mau Piailug

Students - aged 14 to 19 and from Staffordshire and Derbyshire - can also wear 3D glasses in one classroom to see colour animations of the work they are undertaking.

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So we get to see the full beauty of the colour spectrum.

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That is because electronic paper does not need backlighting in the way that liquid-crystal displays do (see article) and making beads or capsules change colour does not take much energy.

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What you will see is a lot of is red, a lucky colour according to Chinese culture.

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Canon Glyn Webster, acting dean of York Minster, said people would be able to see for the first time the window's "rich colour and artistry".

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He called on fellow diners by the colour of their shells (shirts), answered questions from admiring fans and posed for every camera he could see.

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