The most relaxing colors are generally believed to be cool shades such as green and blue. Designers, psychologists, feng shui experts, and advertisers all agree that blues and greens make us feel calm, balanced, and less emotional. They use these hues, especially a sage green, in hospitals, test centers, and television stations to ease nerves and attenuate harsh emotions. Whether this reaction has to do with the effect of wavelengths on brain chemistry, linguistic associations, cultural meanings, or coincidence, has yet to be fully determined. Interior designers note that colors depend on trendy preferences, yet people consistently describe rooms painted blue and green as relaxing and harmonious. Although this provides anecdotal evidence, decorators have attempted to garner respect with backing from some scientific studies. Architects and painters use colors from the cool part of the spectrum like blues and greens on walls and ceilings in bedrooms and bathrooms where people like feelin