A metaphor is often a figure of speech which makes a comparison in between two non-related things. For a literary machine, metaphor results in implicit comparisons with no express usage of “like” or “as. In his e-book In Other Footwear: Tunes, Metaphor, Empathy, Existence Kendall Walton also locations the formulation https://metafora32085.wikibriefing.com/3380425/about_metafora