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One of the best ways to show how colours helps us to see light and shade is to get a piece of satin shredding ribbon and twist it into a bow. Lets take a bright pink as an example. The ribbon is bright pink...but when you look at the shiny bit...that is not bright pink but a pale pink, almost white, and the darker shadow areas are not bright but deeper darker ones. Take bright pink paint. Paint a square with it. Now add a little white and paint another square. Repeat this four times, lightening the colour of the pink each time. Now work in the opposite direction adding black to the original pink colour, four times and getting darker. Now look at the ribbon again...can all nine of these pinks be seen?