the meaning of colors
Physically, colour is an electromagnetic vibration of a specific frequency and can therefore act on the cell via the eye or the skin.
Each colour and each shade of colour has its own quality, symbolism and effect. The brighter a colour is, the more immaterial it is, the more subtle it is.
Colour is a very subjective notion. What evokes a feeling for me will evoke a very different feeling for another person, sometimes for reasons of personal preference, sometimes for cultural reasons. Colour theory is a science in itself, as is the study of how colours affect people.