The Rule of Three (and how to use it in writing)

What is the rule of three?

Have you ever noticed how many things come in threes? You can find several examples in children’s stories, like Goldilocks and the Three Bears or The Three Little Pigs. Or you could look to adult fiction to find the three ghosts that haunt Ebenezer Scrooge, the three witches in Macbeth or Beetlejuice being summoned by three repetitions of his name.

The rule of three even pervades our understanding of science and religion, such as Newton’s three rules of motion and Christianity’s holy trinity.

When we think of well known phrases, many can be reduced to three words: “Ready, aim, fire.” “Lights, Camera, Action.” “Live, laugh, love.”

The idea behind the rule of three is that groupings of this number are more memorable, more emotionally resonant and more persuasive than just one or two, or even four or five.

But why?

Why do memorable things come in threes?

There is a potential reason why our stories are littered with threes, though the theory hasn’t been definitively proven. The best explanation seems to be that our brains look for patterns in everything.

Even the simplest of visual scenes cause us to imbue meaning where there is none. In the 1940s, Heider and Simmel presented research participants with a simple video of basic shapes moving across the screen and found that participants were quick to attribute emotions, motivations and purpose to these two dimensional triangles and lines.

But even with a brain desperate to find meaning in the world, we need something first to apply it to. Three is the smallest number of iterations that can form a cohesive pattern. Take this visual example:

With just two images, you can’t be sure yet what the pattern is and may question if there even is one. There could be a different shape coming next, the circle could be repeated, they might not be related to each other at all. You could guess but you wouldn’t feel sure. Now look at this one:

Do you feel more confident that the next image will be a circle? Do you feel like you’re looking at a pattern rather than just two unconnected shapes? Seeing the three together tends to lead to a feeling of cohesiveness, where our brains start to assume that they are part of a whole.

The same logic works with the formation of a pattern using words or narrative – by the time of the third example, you’re able to draw conclusions about the writer’s intention. But it also becomes a complete arc, something with a beginning, middle and end, something we are very familiar with in storytelling.

Everyone can remember three things

Another advantage to the rule of three is that the repetition helps us to remember the message or story. The cue given by the pattern acts as a memory aid, causing the story to stick in your mind.

In folklore, making stories memorable was particularly important because they were often passed on from person to person, rather than being written down. Even now, filmmakers and authors want us to remember what we have seen so that we can recommend it to our friends and family.

This is likely another reason that our brains like to work in threes. Research shows that an adult has the working memory capacity to hold seven items in mind, plus or minus two. But a child averages around three or four.

Additionally, looking back at the Heidel and Simmer research, a subsequent study by Wick et al. (2020) has shown that even adults, when presented with multiple shapes, struggle to agree on and follow narratives for images with more than four shapes, and performance was best when there were three.

They question why this was such a small number, when you consider that many stories have more than three characters, or three story events, but this is likely to be because of our brain’s ability to ‘chunk’ information into larger parts in real life. We have to work hard to find meaning in random triangles, but life experiences often have connections that we can draw on to help our memory. So we may still only be able to recall three things, but those three things can be much larger if we can group smaller parts into a bigger whole.

For example, if my working memory is capacity is only for four numbers, and I want to learn 12 digits, I could remember them as “1231 – 4367 – 3476″ but I would probably struggle as the number of digits increased, because the different numbers would risk getting confused in my mind. 

Or if I was trying to remember a story I was told, I could remember it by breaking it down into sections, for example, a house of straw blown down by the wolf, a house of sticks blown down the by wolf, then a house of bricks that stayed standing.

When you think that common folklore is often a warning, a message about how to behave or what to protect yourself from, you want everyone to remember the story, so you need it to be as simple as possible, while still containing the information that’s important. So stories were written with a level of repetition to help keep them memorable, but they were also kept short enough to ensure that as little information as possible was lost when they were re-told later by whoever had heard it.

Using the rule of three in writing

There are a few ways that writers can take advantage of the rule of three to make their work more memorable and emotionally resonant.

The three act structure:

The standard form of this is the beginning, middle and end. The set up, the identification of the problem, then the resolution. This doesn’t mean that you need to follow chronological order – plenty of stories build anticipation by showing the end first, then revealing how the characters got there. Your story doesn’t even need to include these elements in the events around the character – in a character driven story, these three elements might all be about how the character resolves an internal conflict.

Repetition in the narrative:

You will have read stories that use this technique – the Goldilocks narrative where something is too hot, too cold, then just right; or the granting of three wishes from a Genie. These narratives allow for elements to be repeated three times within the narrative itself, meaning that the detail within the story is better remembered.

The tricolon:

You can introduce this at the sentence level to make your conveyed message more memorable. These are a set of three parallel words or phrases, similar in length or structure. The use of this technique allows you to build rhythm within the sentence, as well as building emphasis in the content.

When using a tricolon, try to consider that certain patterns often work better than others. Repetition of the same, or very similar, words can work well to place emphasis on your point, such as “The truth, the whole truth, and nothing but the truth” or “See no evil, hear no evil, speak no evil”. But there are other well known examples that establish a different pattern whereby the first two words or clauses are similar – this can be in terms of rhythm, length, syntax, sound – and you then end on something different and usually longer, which emphasises the last section by causing it to stand out from the others. Take for example, “Life, Liberty and the Pursuit of Happiness” or Edgar Allan Poe’s line “While I nodded, nearly napping, suddenly there came a tapping.”

The rule of three is everywhere

The rule of three is such a pervasive form of rhetoric within writing that you will likely see me reference concepts that use it in future articles. But even before then, I’m sure you’ll find many more examples of it in books, television or public speaking.

If you are a writer, look through your work and see if you can spot any examples of it. Or if you enjoy reading, flick through your nearest book and see what you can find.

If you enjoyed reading this, feel free to like, comment and share 😉

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If you’re interested in reading my previous Storytelling posts, you can find them here

Or why not check out my serialised young adult fantasy novel George Square or my published short fiction.

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