A metaphor can be a figure of speech that makes a comparison between two non-very similar things. For a literary unit, metaphor makes implicit comparisons without the Categorical use of “like” or “as. In his e book In Other Shoes: Music, Metaphor, Empathy, Existence Kendall Walton also destinations the formulation https://erickpuxbe.illawiki.com/1500131/metafora_for_dummies