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There is also physical setting, social setting, philosophy setting, (together perhaps world building) and character building scenes. This scene is a beat, a pause in the action, that is needed, an...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/34697 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/34697 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is also physical setting, social setting, philosophy setting, (together perhaps world building) and character building scenes. This scene is a beat, a pause in the action, that is needed, and demonstrates life in the Star Wars universe is not a constant battle. There are things to enjoy. I think you take the "rip your arms off" line too literally, it is an exaggeration of a Wookie making a big deal of being upset. The important point is not that, it is proving Jedi's have a learning curve and proving / foreshadowing Luke can fail. The reader **_does_** need this scene, whether it is a plot point or not, it reveals characters for several people appearing in that scene. I could even argue that it moves the plot forward: Character **abilities** and changing abilities, and character failings and frustrations, are necessary to the plot too. It is a point on the character's arc to to realize "I suck at this," or "I'm sick of trying this, I can't do it." Imagine a movie in which a female protagonist, in the first act, picks up a guy in a bar just to have company for the night, and she spends the night having sex with him in a hotel room. We never see that guy again, there are no consequences of their tryst. But the fact that she is capable of this is an important factor in her story, thus it is important to the plot. (Perhaps a later random tryst IS a plot point.) I could say the same about a superspy movie; it opens with a firefight and our superspy kills some people, and we never see them again or know what they did. No matter, it builds the character of our superspy, he's lethal and calm under fire. Why not show that later? Because on his new mission, he doesn't get to kill anybody for 30 minutes. That's past the first act, and too late to introduce these crucial character traits that will be very important later in the story. Let's say the same thing about a fantasy movie: If you don't introduce magic in the first act, near the opening, it can look like a deus ex machina or completely out of place. I might try to say that magic is so costly it isn't used until the end, but readers will call BS, if magic is a thing, it needs to be shown very early no matter how costly it is. If the setting itself is dangerous (e.g. a sci-fi space setting, a dystopia, a post-apocalyptic nightmare, dinosaurs, time-travel changing history) a scene demonstrating the level of danger is in order, even if it doesn't serve the overall plot. It is building the "character" of the setting. If I am writing a fantasy scene and wish to show a social fact, say that women and men have equal rights, the scene that does that may not move the plot forward, but can be an important thing to know for a later plot point. It is social "character" building. The reader needs to learn about the characters and the world they live in, and some of this is shown by scenes that reveal this information without just **telling** it.