Colour (continued)

Continuing the recent conversation we are having online about colour (sparked off by the purchase of a book on colour mixing), we have had discussions about pixels, the little dots of different coloured light that, in different combinations, make up all the colours we see on the screen. We don't see pixels so much now in the UK on telly since the changeover to digital but they still exist in computer screens and older televisions. I like the idea that dots can represent lots of different things. I wonder what these one could be?  http://www.bbc.co.uk/news/science-environment-18449711