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An "archetype" is the dominant visual representation of the thing in Midjourney's training data, which it will offer you as a default unless you guide it otherwise.
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An "archetype" is the dominant visual representation of the thing in Midjourney's training data. Understanding this concept is a prompting superpower that you can wield in two ways:
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General info about archetypes in the literary sense: https://en.wikipedia.org/wiki/Archetype
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To invoke an archetype, you can use the name of a stereotypical character, action, pose, or scene that Midjourney already knows from its training data. There’s no need to describe all the details!
Let’s look at how this works. See how you can either use a bunch of words or very few words to get a similar visual result?

Instead of: A bearded man wearing a baseball cap, black and red checkered flannel shirt, work boots, denim jeans, carrying an axe
For the same result, say the archetype: A lumberjack
Using the word "lumberjack" and letting Midjourney supply all the default archetypal details makes your prompt more efficient … it uses less processing time than describing the lumberjack yourself. However, if you don’t want your lumberjack to have default characteristics, then you may want to work on Breaking the archetype instead.
Say this, not that!
a puppy delivering maila schoolteacher sits at her desk