half-full or half-empty glass of water, with text written on a blackboard, showing optimism or pessimism, concept

abstract aqua attitude background beverage blue business clean close concept conceptual contradictory crystal decision drink empty face fresh full glass half halfempty halffull happy health healthy isolated lifestyle liquid metaphor mineral motivation natural negative object one opportunity optimism optimist pessimism pessimist positive positivity possible purity reflection refreshing relative showing smiley success thirsty transparent unhappy water