One possible way of thinking about the different elements of story is that those elements include arcs, incidents, and something I’m calling “vibe”: the feel, mood, or tone of the story.
All stories have all of these, though some stories have a lot of one and very little of the others. And different readers have different preferences for the mix of these elements.
Incidents
I’ll start with incidents, since they are the smallest unit, in terms of the number of words used to convey them. A short story can be just an incident (though it’s usually stronger if it includes at least some element of arc and/or vibe).
An incident is one significant thing that happens. It can be a fight, a conversation, a discovery, an escape, a chase, a realization… An effective way to structure your scenes is to make sure that there’s at least one incident in each scene. If your scene doesn’t contain an incident, unless you are writing a very vibey book and the scene is there solely to build the vibe (and does so effectively), that’s probably a scene you don’t need.
An incident can (I’d almost, but not quite, say should) be interesting and enjoyable to the reader in itself. Stories that are strong in incident typically include adventure, suspense, mystery and thriller, but you can have a strong incident that’s a conversation or even just a character reflecting on their life and coming to a conclusion, if your writing chops are good enough. And there are genres–“cosy” fantasy, for example–in which mundane incidents are expected and welcomed; it can be enjoyable to see characters we like or identify with living their daily lives, though again, it takes some skill to achieve this.
Key to incidents, I believe, is that the reader should feel something while reading them. An incident with no emotional significance is just an occurrence. This is why I define an incident as “one significant thing that happens”. The character and the reader both care about the outcome. Mundane incidents that just fill space, like the notorious “morning routine” beginning to a story, generally need to be cut; you can write them to get momentum and feel your way into the character and setting, but you may want to go back and edit them down to a minimum afterwards, because neither your character nor your reader particularly cares.
The books I read as a child and young teenager tended to have a lot of incidents as their main strength, because it’s easy to be engaged by a well-written incident and imagine yourself in the situation. Especially for a young audience, arcs can be a bit rudimentary and, as long as your incidents are strong, you’re still OK.
Speaking of which:
Arcs
There are two main types of arc: the plot arc and the character arc.
Arcs include a number of incidents, which together make more than the sum of their parts. A series of discoveries that gradually reveals something that happened makes a mystery arc. A series of encounters where two people draw (on average) closer makes a romance arc. As the name “arc” implies, these aren’t just any random sequence of incidents; they form a shape, and take things from a beginning state to a different end state. If what is changing relates to a character (their circumstances, their understanding of themselves and the world, what they want, their relationship with others), that’s a character arc; if a broader situation affecting multiple people or the state of the world is changing, it’s a plot arc. You can think of them as inner and outer arcs, if you prefer.
Plot and character arcs are typically intertwined, and ideally your incidents are progressing both at the same time. But it’s possible to write a character who has no arc (Sherlock Holmes is a classic example) and still have a compelling and successful story based on your plot arc alone. And, of course, vice versa; plenty of literary novels succeed despite having very little in the way of external incident at all, because their focus is on the character arc.
Just as an incident has an emotional component, so an arc, either a plot arc or a character arc, is also, ideally, an emotional arc. We start out feeling one way, we go through different emotions along the journey, and we end up feeling another way.
In a mystery, we start out puzzled, go through the triumphs of discovering clues and the setbacks of having our theories invalidated, and end up understanding what happened. In a romance, we start out with the protagonists not together, go through the triumphs when they get closer and the setbacks when they get further apart or when obstacles come up to their happiness, and end up with them together. Those are both emotional journeys of different kinds, and it’s up to the author to structure and sequence their incidents in such a way that the journey is both satisfying and convincing to the reader.
There are conventions to arcs, some of which don’t necessarily reflect how things happen in real life; if the author departs too much from the expected shape of an arc, people who consume a lot of fiction will feel something is off, and the more reflective among them will be able to articulate why. For example, I read a book recently which was clearly a YA post-apocalyptic dystopian, but the protagonists’ interactions with the people who were running the dystopia were mostly positive, and they acted as mentor figures, while the leader of the group who were setting out to overthrow the dystopian regime was clearly toxic, and an antagonist who threatened the protagonists. That set up a dissonance for me that made the book puzzling and unsatisfying, and it was all based on narrative expectation; we expect that, in a dystopia, the bad guys are the ones maintaining it and the good guys are the ones opposing it.
People also have different preferences for what emotions the arc includes. I’ve read many a review that expresses frustration with a whiny character who’s always complaining that the world is against her, even while being a Spoiled Protagonist who gets unearned victory handed to her on a regular basis. Yet other readers love those exact same books, perhaps because they can immerse themselves in the character and dream about what it would be like if their life, where they feel the world is against them, was such that they received the nice things they think they deserve without effort on their part. Mystery readers enjoy the feeling of solving a puzzle and the satisfaction of justice done; romance readers enjoy emotions that are warmer and less abstract than that.
More and more, I’m noticing that books I read which are weak in other ways–such as their mechanics (grammar, punctuation, sentence structure, word usage) or their worldbuilding–can still work for me to a degree if the arc is sound. In the case of the dystopian book I mentioned above, I experienced the opposite; the mechanics and worldbuilding were decent, but the arc didn’t work for me, and I didn’t enjoy it much as a result.
Vibe
Vibe is the most subtle of the elements I’m discussing, partly because–even more so than arcs–it’s the sum of many parts, many small decisions by the author. Choice of words, what’s focused on in descriptions, the choices the characters make, the type of incident that occurs, and, of course, the emotions felt by the protagonist and, through them, the reader, all contribute to vibe.
A romantic comedy and a dark fantasy have very different vibes. If you were a film director, you’d probably shoot the first with lots of movement and colour, on well-lit sets, and the second with longer, lingering shots, slower camera movement, desaturated colours and shadowy sets. (Or, if it was a gritty dark fantasy, sudden, jerky shots reflecting violent action.) The way the actors spoke, the clothes they wore, the music on the soundtrack, but also the stakes, the balance between talking and action, and the kind of setbacks and consequences that occurred would all contribute to the vibe as well.
It’s possible to write a book that’s largely focused on producing a particular vibe. The incidents may consist mostly of someone observing events rather than participating in them, there may be a lot of conversation, the main character (who’s perhaps not truly a protagonist, in that they aren’t striving for anything) is likely to spend a lot of time in self-reflection. This is the kind of book that a lot of people will find boring and slow-moving, because the incidents are subtle and not action-focused and spaced some distance apart by passages of description, and the arc is gradual, and the characters, often, don’t have any obvious goal; others, who enjoy this particular vibe, will love immersing themselves in it and feeling the same emotions for an extended period. The Titus Groan books, I believe, are primarily vibe books; so are books like The Goblin Emperor, although there is something of an arc there. A lot of “cosy” fantasies, in which the incidents are often mundane and of significance mainly to the characters, are heavily vibe-focused.
When an author attempts vibe and fails, I sometimes describe the book as having “not much plot per thousand words”. The failure mode of vibe is to write incidents which are not, in themselves, interesting and which also don’t effectively evoke emotion, just as the failure mode of incident is to write incidents which are perhaps spectacular in themselves but also don’t mean anything to anyone–like many Hollywood action movies. (Hence the famous advice: Don’t write action scenes; write dramatic scenes that require action to resolve.)
Summing Up
Incident, arc, and vibe have a complex relationship, which I feel like I’ve come to understand better by writing this post; hopefully you’ve come to understand it better by reading it.
Incident contributes to vibe by evoking emotion in the character and the reader. An incident can fail by being too minor and mundane to be inherently interesting, or by being too disconnected from any important stakes to have significance, or, worst of all, both. An incident succeeds when the character and the reader care about it, and they will care about it if it is important to an arc (plot or character) or vibe (evoking a mood) or both.
For an incident to matter to an arc, it needs to help or hinder the character in their story goal (plot arc), and/or push against the character’s weaknesses or display and develop their strengths (character arc). But the other contribution incidents make to arcs is by providing appropriate emotions that help to make the arc an arc, and not just a series of events. The most engaging arcs either slowly build a consistent vibe and then either escalate or reverse at the moment of crisis, or they swing the reader and the character back and forth between anticipating triumph and disaster, with an overall average movement in one direction or the other.
Pacing is partly about how the incidents are spaced (how many words we go through to get to the next one), but it’s also about how their emotional beats are ordered, alternated, escalated and de-escalated. Traditionally, we think about “rising action” and “falling action,” in which events build from a base level through gradual escalation to a crisis which reverses the emotional direction and de-escalates the suspense to a satisfying and relieving conclusion, but that’s a 10,000-foot view of most plots; there are often smaller rises and falls, reversals and re-reversals, within them. Some are much more swingy than others.
A vibe can be the sum of the emotions created by a story’s incidents, but in skilled hands it can be more than that. Whether the emotion builds consistently (as in, say, a cosy story) or swings back and forth (as in some suspense stories) is itself a part of the vibe; the first can risk a label of “boring” and the second is more likely to be described as “exciting,” but there are readers who find a consistent build immersive and comforting (even if the emotions are not comforting emotions), and readers who find a swingy build “choppy” and “all over the place”. Even a swingy build needs structure within the overall arc.
For myself, I think considering incident, arc and vibe will strengthen my writing, make more conscious what I’m already doing unconsciously. I hope it does the same for you.