Article: What Is Analogy? Definition and Examples of Analogy in Literature - Source
An analogy is something that shows how two things are alike, but with the ultimate goal of making a point about this comparison.
The purpose of an analogy is not merely to show, but also to explain. For this reason, an analogy is more complex than a simile or a metaphor, which aim only to show without explaining. (Similes and metaphors can be used to make an analogy, but usually analogies have additional information to get their point across.)
Analogy to communicate a concept...
“What you’re doing is as useful as rearranging deck chairs on the Titanic.”
Here, the speaker is using a simile to compare the task being done to the task of rearranging deck chairs on the Titanic. But, the ultimate goal is not just to compare one task to another, it is to communicate that the first task is useless—by comparing it to a similarly useless task, such as rearranging deck chairs on a ship that famously sank into the sea on its maiden voyage.
In writing, there are two predominant types of analogies:
Analogies that identify identical relationships. The modern word “analogy” actually comes from the ancient Greek word for “proportionality,” and Greek scholars used analogies to directly illustrate similar relationships between two pairs of words, often for the purpose of logical argument. These analogies take the form “A is to B as C is to D.” An example of an analogy that identifies an identical relationship is “Black is to white as on is to off.” In this example, the relationship between black and white (that they’re antonyms, or opposites) is exactly comparable to the relationship between on and off (on and off are also opposites).
Analogies that identify shared abstraction. This type of analogy compares two things that are technically unrelated, in order to draw comparisons between an attribute or pattern they share. For instance, consider the analogy, “Raising children is like gardening—nurture them and be patient.” This example compares the pattern that is similar in both raising children and gardening. This type of analogy is useful in writing because it can help make abstract ideas (like raising children) more concrete by drawing on readers’ background knowledge of familiar images (like gardening).
How Do You Write a Good Analogy?
Try to create easy-to-understand imagery. If you’re trying to explain to your reader how one thing is similar to another, you have to make sure the example you’re using is common and easily understood. The point of an analogy is to encourage deeper thought, and that won’t work if the readers are unfamiliar with the image you’re conjuring.
Work to compare and contrast. Think about the idea you’re trying to get across. When trying to find something commonplace to compare it to, think about possible connections between the two things—both similarities and differences. Which evokes the most powerful image? Which will be able to set up the comparison the clearest?
Think of ways to inspire. The best analogies both explain and inspire. As a literary device, an analogy is a powerful way to communicate a message. However, it can also turn an idea into a vivid image in the reader’s mind that will stick long after they’ve finished reading.
Reasoning by first principles removes the impurity of assumptions and conventions. What remains is the essentials. It’s one of the best mental models you can use to improve your thinking because the essentials allow you to see where reasoning by analogy might lead you astray.