The document discusses colour theory and the colour wheel. It defines colour theory as relating to the physiological impacts of colour combinations. The colour wheel is a circular arrangement of colours organized by their relationship. It includes primary colours of red, yellow and blue, secondary colours of orange, green and violet, and tertiary colours that are mixtures of primary and secondary. Each colour is then defined, discussing their traditional meanings and associations across cultures. The document concludes that the colour wheel combines warm and cool colours, and colour choice can indicate events or individuals.