Colours, like features, follow the changes of the emotions," the artist Pablo Picasso once remarked. Colour is a powerful communication tool that can be used to signal action, influence mood, and even influence physiological reactions. Certain colours have been associated with increased blood pressure, increased metabolism, and eyestrain. Colour psychology is the study of hues as a determinant of human behaviour. Colour influences perceptions that are not obvious, such as the taste of food. Colours have qualities that can cause certain emotions in people.
