People connect blue with sadness but the color blue can also have a healing effect . If a person is meditating his or her blood pressure and pulse rate decrease . Brain waves and hormone production slow down too . The same symptoms occur in a person who stares at something that is the color blue . Consequently blue is used too soothe people . Hospitals put babies with jaundice under special blue lights for example and many doctors pain waiting rooms blue to relax nervous patients.