THE WHOLE JOURNEY AS TEXT
The same journey,
to read at your own pace.
Everything from the seven stations in the 3D world is here, with all its sources. The answers to the statements sit behind a button, so you can guess first.
01 · Feeling · How do you know the Earth is round?
You’re completely sure. Rightly so?
The Earth is round. You know that. But stay with the question for a moment, because it is more honest than it sounds: how do you actually know?
What does your certainty rest on?
I’ve seen it with my own eyes
From the ground, none of us can see the shape of the Earth. Ships disappearing over the horizon and lunar eclipses are clues — but you, like all of us, got the interpretation of them from others.
I trust photos, scientists and textbooks
The most honest answer for most of us — and a wise choice. But notice what it means: your certainty rests on trust, not on checking for yourself.
Everyone I know knows it’s true
That is how most of what we know works, and usually it works well. But “everyone knows” has been wrong before — and that is exactly how it feels from inside a filter bubble, too.
I’ve never actually checked for myself
Thank you for being honest. Almost no one has checked for themselves. Yet your certainty is — rightly — close to one hundred percent. How does that add up?
The Earth is round. But for most of us, that certainty rests on trust in other people’s work — satellites, flight routes, shipping, physics — not on our own measurements. Someone convinced of the opposite has the same feeling of certainty. The difference is not the feeling. It is the process behind it.
Trusting independent sources that point the same way is not cheating — it is how knowledge works.
02 · Conviction · The way in, step by step
Nobody wakes up one morning a flat-earther.
A conviction is built in steps, and every step feels reasonable from the inside. Follow the path below — it is uncomfortably familiar.
STEP 1 OF 4 · The crackIt starts with a reasonable question.
Rarely with stupidity. More often with genuine puzzlement — “why does the horizon look flat?”, “why did my child fall ill right after the jab?” — and a sense that the answers you get dismiss you rather than listen.
STEP 2 OF 4 · Own researchThe search box says you’re right.
“Do your own research” sounds like science. But feeds and search engines reward whatever keeps you there. Search for proof that the Earth is flat and that is exactly what you get — not the strongest case against it.
STEP 3 OF 4 · The communityThe conviction gets a face.
On the other side, people are waiting who listen, take your questions seriously and call you brave. The conviction becomes an identity and a place to belong. Leaving it costs friends — not just an opinion.
STEP 4 OF 4 · The shieldCounter-arguments become fuel.
In the end the conviction protects itself: every piece of counter-evidence becomes a sign of how deep the cover-up goes. The system is closed — no conceivable proof is let in. That is where it stops being a question.
The mechanisms are universally human — the same machinery builds everyday convictions about colleagues, diet and politics.
Hornsey, Harris & Fielding (2018): the psychological roots of anti-vaccination attitudes ↗03 · Certainty · Feeling meets reality
Sure is a feeling.
Correct is something else. Take a stand on three statements that many people are completely sure about. Afterwards we compare how sure you were with how it went.
We humans use only ten percent of our brains.
False — but the myth is so widespread that it feels like general knowledge. Brain imaging shows activity in practically the whole brain, and damage to the “unused” parts has clear consequences.
Honey stored properly can keep for thousands of years without going bad.
True. Low water content and low pH mean microorganisms cannot thrive. Edible honey has been found in Egyptian tombs that are several thousand years old.
Sugar makes children hyperactive.
False. Double-blind studies show no effect of sugar on children’s behaviour. But parents who believe their child has had sugar rate the child as more unruly — expectation colours what we see.
The Great Wall of China is the only human-made structure visible from space.
False. The wall is narrow and earth-coloured — astronauts struggle to see it even from low orbit. Roads, dams and lit-up cities, on the other hand, are clearly visible. The myth is older than spaceflight itself.
There are more trees on Earth than stars in the Milky Way.
True, and it surprises most people. Estimates come to about three trillion trees — against the Milky Way’s 100–400 billion stars. Intuition about large numbers is notoriously unreliable.
We lose most of our body heat through our heads.
False. Heat loss is roughly proportional to the area of exposed skin — the head is no special leak. The myth is often traced to an old military experiment in which only the head was left uncovered.
Three statements are a snapshot, not a profile. The point is the gap between feeling and outcome — we all have it.
04 · Rationality · Ability and attitude
Being smart is no vaccine.
Among those who are sure the Earth is flat are engineers and pilots. The ability to solve problems and the willingness to scrutinise your own conclusion are different things. Switch between them and see what the model brings out.
Problem-solving abilityHow strong is the engine?
Working memory, abstraction and fast processing help us solve hard problems. But a strong engine can also drive the wrong way — faster, and with better arguments.
Quality of thinkingWhere do you point the ability?
Seeking counter-evidence. Weighing alternatives. Updating a view. High intelligence makes no one impartial — it can make you a more skilful defence lawyer for what you already believe.
Stanovich, West & Toplak (2013) ↗05 · Self-image · Beyond the Dunning–Kruger meme
Even a good story can get it wrong.
“The less you know, the more certain you are” — the curve is shared as scientific fact. But the story about overconfidence deserves scrutiny too. See the difference between the meme and the research question.
The internet story · A SIMPLIFICATION“The less you know, the more certain you are.”
A punchy line. But it says more than the studies show. The popular roller-coaster curve is not an established path of development that everyone follows.
The research question · A DISPUTED EXPLANATIONHow do we measure self-assessment?
The original hypothesis concerns a lack of skill and difficulty spotting your own mistakes. But regression to the mean, scale limits and better-than-average effects can also contribute to the pattern. Researchers disagree about how much remains.
Methodological critique: Gignac & Zajenkowski (2020) ↗A later replication and objection ↗06 · Merit · From zero to a billion?
Did they earn it?
The story of someone who started with nothing and fought their way to a fortune is one of the best-loved we have. Sometimes it is true. Guess first, then see what the research says — and why we are so keen to believe it.
GUESS FIRSTWhat share of Sweden’s dollar billionaires had inherited their fortune in 2014?
- Fewer than one in five
- About one in three
- About two in three
- Almost all
Show the answer
About two in three. When researchers went through every billionaire on the 2014 Forbes list, 63 percent of the Swedish ones had inherited their fortune. The measure is broad: anyone related to the founder of the company counts as an heir, even if they have grown the fortune themselves.
Forbes itself counts 71 percent of the 400 richest people in the US as self-made in 2026. But on the Forbes scale, someone who got a head start from wealthy parents, or grew up in the middle or upper middle class, also counts as self-made. When the list was examined in 2014, that was true of six in ten of the self-made.
Swedish billionaires are few, so the share can shift a lot from year to year. And inherited or self-made says nothing about whether someone deserves their fortune. That is a question of values. This is about how sure we are of the story.
WHY WE ARE SO SURE · 1 OF 5 · Just worldWe want the world to add up.
Most of us need to believe that people by and large get what they deserve; otherwise the world feels arbitrary and unsafe. That is why the story of someone who started with nothing and worked their way up feels so right: it confirms that effort pays off. Researchers call it the belief in a just world.
Hafer & Bègue (2005): a review of research on the belief in a just world ↗ WHY WE ARE SO SURE · 4 OF 5 · EnvyAnd yes, envy exists.
The same demand for evidence applies in the other direction. In a study with over 6,000 participants in four countries, envy was the only thing that predicted wanting to raise taxes on the rich even when the poor got less out of it. Compassion instead predicted wanting to help the poor. Emotions steer on both sides.
Sznycer et al. (2017): compassion, envy and self-interest ↗ WHY WE ARE SO SURE · 5 OF 5 · Not stupidityIt is not about intelligence.
It is tempting to think that only the less gifted buy the story. The research does not support that. In Swedish data, higher cognitive ability went together, on the contrary, with less support for redistribution, partly through the belief that effort decides more than luck. The study is small, but it points the wrong way for anyone who wants to dismiss others as stupid. Being smart is no vaccine.
Mollerstrom & Seim (2014): cognitive ability and views on redistribution ↗ How are the rich taxed in Sweden? Skattkartan, in Swedish ↗07 · Evidence · How do you know?
What does your conviction rest on?
Bring a claim you believe in yourself — ideally one that feels obvious. Every part you examine gets a place in the model. These are your notes, not automatic fact-checking.
- What exactly do you believe?
- What do the words mean? What are you assuming?
- Which sources support the claim?
- What speaks against it?
- What other explanations are there?
- What would change your mind?
Your notes stay on the page and disappear when it reloads.
ABOUT THE EXPERIENCE
Your certainty can be examined.
SÄKER? (Swedish for “Sure?”) is an interactive museum of thought about beliefs: how the feeling of knowing arises, and why it is the same whether you are right or wrong. The architecture and sculptures are symbolic, not depictions of the brain’s anatomy.
The examples — the flat Earth, anti-vaccine attitudes, everyday myths, the story of the self-made fortune — were chosen to show how certainty works, not to single anyone out. A short round cannot diagnose bias or measure your rationality. Answers and notes are not kept when the page reloads.
The research behind it
Hornsey, Harris & Fielding (2018): Psychological roots of anti-vaccination attitudes ↗Stanovich, West & Toplak (2013): Myside Bias ↗Dekker et al. (2012): Neuromyths in education — including the ten percent myth ↗Wolraich, Wilson & White (1995): Sugar and children’s behaviour, a meta-analysis ↗Gignac & Zajenkowski (2020): Dunning–Kruger, a methodological critique ↗Reevaluating the Dunning–Kruger effect: a replication ↗Freund & Oliver (2016): The Origins of the Superrich ↗Hafer & Bègue (2005): Experimental research on just-world theory ↗Jost, Banaji & Nosek (2004): A decade of system justification theory ↗Mijs (2021): The paradox of inequality ↗Bénabou & Ok (2001): The POUM hypothesis ↗Alesina, Stantcheva & Teso (2018): Intergenerational mobility and preferences for redistribution ↗Sznycer et al. (2017): Support for redistribution ↗Mollerstrom & Seim (2014): Cognitive ability and the demand for redistribution ↗More sites in the same spirit
SkattkartanThe tax map. Where does tax money go? Follow one krona from a Swedish pay packet to the services a municipality runs. In Swedish.Sweden — through timeHow Swedish society developed from 1900 to 2026, in a symbolic 3D city.Back to the 3D world ↑