The photos at the top of each summary add colour, but they suggest an obligation to aesthetics more than the fulfilment of any sort of function.

FORBES: Teenage Mogul Launches 'Summly' To Revolutionize Mobile Reading

The crowns on his top teeth are a completely different colour from his own teeth in his bottom jaw.

ECONOMIST: Letters

The capsules are arranged as pixels and electric charges applied to each pixel pull either the black or the white particles towards the top of the capsule (and the opposite colour to the bottom).

ECONOMIST: Electronic screens as thin as paper are coming soon

Far from causing confusion, the difference in colour has seen Walkers chart an inexorable march to the top of the UK crisp market.

FORBES: Why Picking The Right Color Can Make Or Break A Brand

Last May, Plastic Logic demonstrated a paper-like flexible screen capable of playing video in colour, which is achieved by placing a filter on top of the original black-and-white display.

BBC: Bend me, shape me: Flexible phones 'out by 2013'

Top film maker Rituparno Ghosh described him as a man "who created fairy tales out of colour and lines".

BBC: Ganesh Pyne

While colour is far from the primary reason why any of these brands has reached the top, it is an example of the kind of mould-breaking thinking that takes them there.

FORBES: Why Picking The Right Color Can Make Or Break A Brand

Wearing maroon jerseys (the only colour available at the local sporting-goods store), and with high-top shoes, leather maskless helmets and trousers padded with magazines, the Maroons beat the league's other strong team, the Chicago Cardinals, towards the end of the 1925 season.

ECONOMIST: An old wrong may be about to be righted