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’s a twist this time. We haven’t changed the letters or the sequence. All we’ve done is change the way the letters are grouped. Once again, study the letters for ten to fifteen seconds, then close the book and test your recall.

JFK FBI NATO UPS NASA IRS

Chances are you did much better the second time. Suddenly the letters meant something, which made them easier to remember. In Round 1, you were trying to remember raw data. In Round 2, you were remembering concepts: John F. Kennedy, the FBI, the North Atlantic Treaty Organization, UPS, NASA, the IRS.

But wait a second. Why is it easier to remember “John F. Kennedy” than the random letters F, J, K? Surely John F. Kennedy is a bigger bundle of information than the three random letters! Think of all the associations with JFK—politics, relationships, his assassination, and his famous family. If remembering was like weight lifting, it would be ridiculous to think we could “lift” JFK easier than three little letters!

The secret, of course, is that we’re not “lifting” JFK. All the remembering work related to JFK has already been done. We’ve already built those muscles—the concept of JFK, and all its associations, is already embedded in our memories. What we’re remembering is simply a pointer to this information—we’re posting a little flag on the terrain of our memory. With the raw letters, we’re posting three separate flags. In the end, it’s one bit of information (or one flag) versus three, and it’s no surprise that one is easier to remember.

So what? Is this just neat brain trivia? Here’s where we’re going: We’ve seen that compact ideas are stickier, but that compact ideas alone aren’t valuable—only ideas with profound compactness are valuable. So, to make a profound idea compact you’ve got to pack a lot of meaning into a little bit of messaging. And how do you do that? You use flags. You tap the existing memory terrain of your audience. You use what’s already there.

The Pomelo Schema

So far we have presented situations in which one simple idea, or a handful of simple ideas, were useful in guiding behavior. But, let’s face it, most people in the world do complicated things. It’s not our intention to argue that complicated things—law, medicine, construction, programming, teaching—can be pared down to two or three compact messages. We obviously can’t replace a school of architecture with a single compact idea (“Keep the building from falling down”).

This leads us to an important issue that we haven’t discussed yet: How do you turn a freshman into an architect? How does complexity emerge from simplicity? We will argue that it is possible to create complexity through the artful use of simplicity. If simple ideas are staged and layered correctly, they can very quickly become complex.

Let us teach you what a “pomelo” is. (If you already know what a pomelo is, be a good sport and feign ignorance.) Here is one way that we can explain to you what a pomelo is:

EXPLANATION 1: A pomelo is the largest citrus fruit. The rind is very thick but soft and easy to peel away. The resulting fruit has a light yellow to coral pink flesh and can vary from juicy to slightly dry and from seductively spicy-sweet to tangy and tart.

Quick question: Based on this explanation, if you mixed pomelo juice half and half with orange juice, would it taste good? You might make a guess, but the answer is probably a bit ambiguous. Let’s move on to an alternative explanation:

EXPLANATION 2: A pomelo is basically a supersized grapefruit with a very thick and soft rind.

Explanation 2 sticks a flag on a concept that you already know: a grapefruit. When we tell you that a pomelo is like a grapefruit, you call up a mental image of a grapefruit. Then we tell you what to change about it: It’s “supersized.” Your visualized grapefruit grows accordingly.

We’ve made it easier for you to learn a new concept by tying it to a concept that you already know. In this case, the concept is “grapefruit.” “Grapefruit” is a schema that you already have. (“Schema” is a bit of technical jargon from psychology, but it’s so useful

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