For instance, three-colour language systems, which lump red and yellow together, generally exclude whitish yellow from that category as does the model.

ECONOMIST: Psychology

The brain's interpretation of colour is actually a three-step process.

ECONOMIST: The biology of art

Each storybook covered the same plot - three children and what happened when their cat got stuck in a tree - using colour illustrations and a simple text narrative.

BBC: Children shun fictional 'fat Alfie'

"Emotionally it kicks you in the guts, " said the world record-holder who has now failed three times to win an Olympic medal of any colour.

CNN: Radcliffe can't explain nightmare

South American artist Carlos Cruz-Diez has created three rooms in his picee Chromosaturation, each composed of an entirely solid colour in which you can fully immerse yourself.

BBC: Look on the bright side at London��s light show

In the three elderly care wards at St Thomas's Hospital doors to toilets and washrooms have been colour-coded with bays to give patients visual prompts in finding their way round.

BBC: Getting it right for dementia patients

With over 600 pages of good-quality paper, his is a massive three-decked battleship of a book, in general handsomely produced, but let down by some poorly designed colour plates, including a number of reversed images.

ECONOMIST: British naval history