This common quality has traditionally been referred to as " tertium comparationis ".
2.
Both forest and sea might represent each of these two elements, and the green color of either forest and sea might be one plausible " tertium comparationis " for the metaphor.
3.
A metaphor usually consists of three elements : the " tenor " ( target ), a " vehicle " ( source ) and the " tertium comparationis " ( some common ground that exists between target and source domain ).
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