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epa08429226 Dancers of the Czech National Ballet perform during a costume rehearsal of 'Swan Lake' at the National Theatre in Prague, Czech Republic, 25 March 2019 (re-issued 18 May 2020). As prominent in both sky and sea, the color blue is often associated with open spaces, freedom, depth and wisdom. In psychology blue is viewed as a non-threatening color and it is believed to have positive and calming effects on body and mind. Often linked with intellect, confidence and reliability, it is known in corporate America as a power color. EPA/MARTIN DIVISEK ATTENTION: This Image is part of a PHOTO SET *** Local Caption *** 55127372