Isaac Newton in the 17th/18th century deduced that sunlight is made up of the ‘spectrum’, a term referring to the components of white light. The components of sunlight can be seen when its wave length is separated (through refraction) by a glass prism. The result is a rainbow with ‘seven’ colours, red, orange, yellow, green, blue, indigo and violet
Overall our colour preferences are deeply engrained, emotional responses that appear to lack a rational basis, but where do our preferences come from? Evolution or learned behaviour?