Edward de Bono coined "lateral thinking" in 1967. He was a Maltese physician who noticed that medical diagnosis often required abandoning the first hypothesis entirely and approaching symptoms from a completely different angle. He spent the next 50 years turning that observation into a formal method with specific, repeatable techniques. Sixty-two books later, the term entered the Oxford English Dictionary.

The definition, minus the jargon

Lateral thinking means approaching a problem from a direction that isn't the obvious one. Vertical thinking digs deeper into the current approach — more data, more analysis, more refinement of the existing solution. Lateral thinking abandons the current approach and starts from a different position entirely.

A vertical thinker asks: "How do we make this product cheaper?" A lateral thinker asks: "What if we charged more and sold to a completely different customer?" Both are valid. But vertical thinking only works when you're already on the right path. When the path itself is wrong, lateral thinking is the only way out.

De Bono's analogy: vertical thinking is digging the same hole deeper. Lateral thinking is digging a new hole somewhere else. You can't dig a hole in a different place by digging the same hole deeper. With lateral thinking explained this way, it sounds obvious. The hard part is recognizing when you're in the wrong hole.

Vertical vs lateral: a concrete example

A hotel chain received constant complaints about slow lifts. The vertical response: faster motors, better algorithms, express floors. Expensive. Slow to implement. The lateral response: install mirrors next to the lifts. Complaints dropped by 70%. People stopped noticing the wait because they were checking their reflection. The problem wasn't speed. It was boredom.

This example, d in de Bono's "Lateral Thinking: A Textbook of Creativity," captures the core idea. The vertical approach solves the stated problem. The lateral approach questions whether the stated problem is the real problem.

Another: a factory couldn't stop workers from taking naps in the storeroom. Vertical solutions — locks, cameras, penalties — created resentment. The lateral solution: remove all chairs and flat surfaces from the storeroom. No enforcement needed.

De Bono's four techniques

De Bono formalized lateral thinking into specific techniques. The most practical four:

Random entry

Pick a random word from a dictionary. Force a connection between that word and your problem. A logistics company stuck on delivery routes once drew the word "garden." The connection: gardens have seasons. The solution: seasonal routing that adjusted for predictable traffic patterns around schools and holidays. The random word bypasses your brain's default pathways and forces a new starting point.

Provocation (Po)

Make an absurd statement about your problem and explore it seriously. "Po: restaurants should have no menu." Absurd — but it leads to the omakase model, where the chef decides. Applied outside food: what if a SaaS product had no feature list and instead asked what you needed? That's essentially what onboarding surveys and guided setup wizards do now. The absurd provocation pointed toward a real product pattern.

Challenge assumptions

List everything you assume about the problem. Then ask "why?" for each one. Southwest Airlines challenged the assumption that airlines need assigned seats. Removing assigned seating cut turnaround time by 25 minutes per flight — a change worth billions in annual operational savings. The assumption felt like a law of nature. It was a convention.

Analogies from other domains

Velcro came from George de Mestral examining burrs stuck to his dog's fur after a hike in 1941. He didn't set out to invent a fastener. He noticed a mechanism in biology and transferred it to manufacturing. De Bono argues that deliberate cross-domain thinking — asking "how does nature, sports, or cooking solve a similar problem?" — replicates this process intentionally.

Real companies that used lateral thinking

Dyson asked why vacuum cleaners needed bags at all — a direct assumption challenge that spawned a $6.5 billion company. James Dyson spent five years on this single lateral question. The entire business model came from rejecting one unexamined assumption.

Nintendo asked what gaming would look like if you didn't compete on graphics — a lateral move that produced the Wii, which outsold the technically superior PS3 by 2:1 in its first three years. While Sony and Microsoft poured resources into visual fidelity, Nintendo changed the input device. Different hole, not a deeper one.

Liquid Death sells canned water in a tallboy can with heavy metal branding. The lateral insight: the water market's problem wasn't the product. It was the branding. A category full of purity messaging needed someone to sell the same thing wrapped in irreverence. The company reached a $700 million valuation by 2023.

How to practice lateral thinking

With lateral thinking explained as a framework, the next step is repetition. The concept is straightforward. Doing it under pressure is hard. Your brain defaults to vertical paths because they're metabolically cheaper — proven solutions require less energy than novel ones. Cognitive psychologists call this the "path of least resistance" effect, and it strengthens with every repetition.

Daily practice changes the default. Sparks includes lateral thinking exercises that force random entry, provocation, and assumption-challenging on real-world scenarios. Each exercise takes five minutes. AI scores your responses on originality — whether you actually left the obvious path or just reworded it.

Over weeks, the lateral move becomes a reflex instead of an effort. That's the difference between knowing about lateral thinking and having it available when you need it — under deadline, under pressure, when the vertical path isn't working and you need a new hole.