half-full or half-empty glass of water, demonstrates the saying that opposes positivists and negativists, concept

abstract aqua attitude background beverage blue business clean clear close concept conceptual contradictory crystal cup decision demonstrates drink empty fresh full glass half halfempty halffull health healthy isolated lifestyle liquid metaphor mineral motivation natural negative negativists object one opportunity opposes optimism optimist pessimism pessimist positive positivists positivity possible purity reflection refreshing relative saying success that thirst thirsty transparent water