Some ideas just refuse to stick. You read them, understand them in the moment, and then they vanish. This usually happens with abstract or complex concepts — things that do not have a clear physical form for your brain to latch onto.
The fix is surprisingly simple: turn the abstract into something concrete using a metaphor.
This technique is one of the most powerful strategies taught in the Learning How to Learn course by Dr. Barbara Oakley and Dr. Terrence Sejnowski, one of the most popular online courses ever created. Metaphors and analogies help your brain build neural pathways faster by connecting new information to things you already understand.
Why Metaphors Work for Memory
Your Brain Loves Connections
Memory is not like a filing cabinet where facts are stored independently. It works more like a web — new information sticks best when it connects to existing knowledge. A metaphor creates an instant bridge between something unfamiliar and something your brain already knows well.
For example:
- Electricity is hard to visualize. But “electricity flows through wires like water flows through pipes” gives you an immediate mental model.
- The immune system is complex. But “white blood cells are like soldiers defending a castle” makes the concept vivid and easy to recall.
Metaphors Activate Multiple Brain Regions
When you think about a metaphor, your brain does not just process the words — it activates sensory and emotional regions related to the comparison. “The economy is overheating” triggers associations with heat, danger, and urgency. This multi-region activation creates a stronger, more durable memory trace.
They Simplify Without Losing the Core Idea
A good metaphor strips away unnecessary complexity and highlights the essential relationship. You do not need to understand every detail of how neurons fire to grasp that “neurons that fire together, wire together” — the metaphor of “wiring” gives you the key concept immediately.
How to Create Effective Metaphors
Step 1: Identify the Core Concept
Ask yourself: “What is the one thing I need to understand about this?”
Strip the idea down to its essential behavior or relationship. For example, if you are learning about compound interest, the core concept is: small amounts grow exponentially over time.
Step 2: Find a Familiar Parallel
Think of something from everyday life that behaves the same way:
- Compound interest → a snowball rolling downhill (it picks up more snow as it grows, accelerating)
- An algorithm sorting data → sorting a hand of playing cards (you pick up each card and insert it in the right position)
- The brain’s diffuse mode → a pinball machine with widely spaced bumpers (thoughts bounce loosely, making unexpected connections)
The more vivid and physical the comparison, the better it works.
Step 3: Test the Metaphor
A good metaphor should:
- Feel intuitive — someone hearing it for the first time should nod, not squint
- Capture the key relationship — it does not need to be perfect in every detail
- Be visual or sensory — the best metaphors create a picture in your mind
If the metaphor confuses more than it clarifies, try a different comparison.
Step 4: Use It When Reviewing
When you review the concept later — whether through spaced repetition flashcards or self-testing — recall the metaphor first. This retrieval practice strengthens both the metaphor and the underlying concept.
Examples of Powerful Learning Metaphors
| Concept | Metaphor |
|---|---|
| RAM in a computer | A desk — the bigger it is, the more documents you can spread out and work on at once |
| DNA replication | Unzipping a zipper and building a matching half for each side |
| Procrastination | A monster that shrinks the moment you face it |
| Neural pathways | Trails in a forest — the more you walk a path, the clearer and easier it becomes |
| Opportunity cost | Every door you open means another door closes |
Tips for Using Metaphors Effectively
Make them personal
A metaphor that connects to your experience is more powerful than a generic one. If you are a cook, frame concepts in terms of recipes and ingredients. If you play sports, use game analogies.
Know the limits
Every metaphor breaks down at some point. Water does not actually flow through wires. That is fine — the metaphor’s job is to get you started, not to replace the full understanding. As your knowledge deepens, you can refine or replace the metaphor.
Combine with other techniques
Metaphors become even more powerful when paired with:
- Visualization — picture the metaphor as a vivid scene
- Story linking — weave multiple metaphors into a narrative
- Spaced repetition — review the metaphor at optimal intervals
Teach someone else using your metaphor
Explaining a concept through a metaphor to another person is one of the best ways to solidify your own understanding. If they get it immediately, you know the metaphor works.
Getting Started Today
- Pick a concept you are currently studying that feels abstract or hard to grasp.
- Write down the core idea in one sentence.
- Think of something from everyday life that works the same way.
- Create a flashcard with the concept on one side and your metaphor on the other.
- Review it using a spaced repetition app like Memwiz.
The next time you encounter a difficult idea, do not fight to memorize it directly. Instead, ask: “What is this like?” That one question can turn a forgettable fact into a lasting memory.
Watch: Barbara Oakley on Learning How to Learn
Video: “Learning How to Learn” — Barbara Oakley at TEDxOaklandUniversity
Cover image by Andrew Neel on Unsplash.