Take a good look at the image.
You have 672 made from matchsticks.
Your challenge is simple:
🔥 Move just ONE matchstick and make 672 smaller than 500.
Sounds easy… until your brain starts trying to solve it.
Before you keep reading, have a go.
Which matchstick would you move — and where would you put it?
🧠 But This Is About More Than a Puzzle
What makes challenges like this fascinating isn’t just whether you get the answer right.
It’s how your brain approaches the problem.
The moment you’re told to make 672 smaller than 500, your brain naturally starts searching within a familiar set of rules.
You see numbers.
You assume mathematics.
You start mentally rearranging the matchsticks, trying to turn a 6 into something else, change the 7, alter the 2, subtract something…
But here’s the interesting part:
What if the biggest obstacle isn’t the puzzle?
What if it’s the rules your brain has automatically created around it?
🔍 Your Brain Loves Patterns
Our brains are incredibly good at recognising patterns, making predictions and using previous experiences to quickly interpret what’s in front of us.
Most of the time, that’s extremely useful.
But it can also create a kind of mental tunnel vision.
Once your brain decides “this is a maths problem,” it becomes much harder to see solutions that sit outside that interpretation.
That’s why lateral-thinking puzzles, illusions and sensory experiences can be so powerful.
They challenge the brain to stop asking:
“How do I solve this using the obvious rules?”
…and start asking:
“Are those actually the rules?”
💡 Thinking Outside the Box
Thinking outside the box isn’t necessarily about being smarter.
Sometimes it’s simply about being willing to change perspective.
In business, relationships, creativity and everyday problem-solving, we can become so focused on the obstacle in front of us that we repeatedly attack it from the same direction.
Move something.
Change the angle.
Challenge an assumption.
Look at the problem from somewhere you haven’t looked before.
Because sometimes the solution was sitting in front of you the entire time — your brain just wasn’t looking for it.
🎩 That’s the Power of Perception
As an illusionist, one of the things I find fascinating is how easily our perception can influence what we believe is possible.
Your eyes provide information.
Your brain interprets it.
And sometimes the most powerful illusion isn’t what you’re seeing…
It’s what your brain assumes you’re seeing.
So go back to 672.
One matchstick.
Smaller than 500.
🔥 Can you solve it?
Drop your answer in the comments — but don’t give the secret away too quickly. Give everyone else’s brain a chance to wrestle with it first.
If you’re interested in the science behind thinking and perception, research into cognitive psychology explores how our brains process information, recognise patterns and solve problems.
Think differently. Challenge the obvious. And never assume the box you’re thinking inside actually exists.
— Dr Ace
