The colour of the sea changes as the light advances up the sky.

BBC: Sardinia, land and sea

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

ECONOMIST: Mau Piailug

Oldman is sporting a pink shirt, his Commissioner Gordon moustache (he is currently filming the latest Batman movie, The Dark Knight Rises) and a pair of heavy-framed, light brown glasses, which match the colour of his hair.

BBC: Gary Oldman's Smiley: 'A little sexier, a little crueller'

That lengthens the wavelength of the light and shifts it towards the red end of the colour spectrum.

ECONOMIST: Fundamental physics

The colour depends on the properties of the semiconductor, and these can be tuned to produce light that is similar to natural daylight but with virtually no ultraviolet or heat.

ECONOMIST: Lighting: A brilliant new approach | The

The system, which combines light, colour and rendering in one, was used in the likes of Shrek and Madagascar.

BBC: The Hobbit picks up technical Oscar

Mr Ball next treats us to a brisk description of the human eye (remember rods and cones from school biology?), an explanation of why Newton was right and Goethe wrong about the composite character of white light, and an account of the 19th-century regimentation of the continuous colour spectrum by means of colour wheels and other classifying devices.

ECONOMIST: Science and history of colour

The ridge of the South Downs I was walking had become a frontier in the landscape, dividing the world into realms of weather, light and colour.

BBC: England��s ghostly South Downs Way

The details of Mr Scappaticci's career that were reported this week are heavy on colour but light on provenance.

ECONOMIST: Northern Ireland

From this it was possible to work out which wavelengths of light the planet reflects, and which it absorbs in other words, its colour.

ECONOMIST: Extrasolar planets