Colors are formed by light, which is also a type of energy.
Scientists have investigated that people experience
psychological change when they are in contact with
different colors. Colors can stimulate, excite, and form
different emotions (Perry and Wisonm, 2003). Each color
results in various reactions (Schmitt and Simonson,
1997). Color with a long wavelength has a stimulus
effect; for example, red is a vivid color. A short
wavelength of color has a comfort effect; for example,
blue can reduce blood pressure and pulse. Orange
indicates friendliness, pink represents softness, and grey
specifies professionalism (Gob’e, 2001).