- Useyellowtoevokepleasant,cheerfulfeelings.ADVERTSfromtheearlyyearsofSouthwestAirlinesevokealostera.And,researcherssay,pleasantenvironmentsgenerallyevokemorereciprocalsmilesandhellosthanunpleasantones.Coolcolorssuchasbluesandgreenstendtoevokeserenitya...
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