This is the most simplest classification of colours. All the visible colours can be divided into two basic categories— warm colours and cool colours as shown in the figure alongside. Normally, warm colours are considered as aggressive and active colours while the cool colours are considered as passive and receding colours.
A range of colour hues from redish-violet to yellowish-green is considered as warm colours. On the other hand hues ranging from green to violet are considered as cool colours.
