Ideas you can touch
Reading about an idea is one thing; holding it is another. Thirty-three machines in eight wings, each an essay in disguise. Nothing here is decorative, and one of them will remember you tomorrow.
Thirty-three machines across eight wings: doors that broke a thousand mathematicians, markets that stampede, a short squeeze with your name on it, boardrooms that really happened, penalties, pulled goalies, forests that burn, your whole life drawn in weeks, and at the very bottom, a punch card that keeps score for life. The bench map below jumps anywhere. Play honestly.
“THE MARQUEE”
The machines people talk about afterward: your whole life in squares, a game-show host with a secret, paper folded past the Moon, the universe on one slider, and a bomber full of holes.
Your life in weeks
A 90-year life fits in the grid below, one square per week. Set your age. The dark squares are spent. The pulsing one is this week, the one you are currently spending on this website.
Every plan you are postponing lives in the cream squares. There are fewer of them than the feed wants you to notice.
The three doors
In 1990 a columnist named Marilyn vos Savant printed the correct answer to this puzzle and roughly ten thousand readers wrote in to call her an idiot. About a thousand of the letters were signed with a PhD. Every one of them was wrong. You are about to play the exact game they argued about, against a host who knows where the prize is and never forgets a round.
“Three doors. Behind one, a 100× return. Behind two, nothing. Pick, and I’ll show you a little secret about one of the others.”
Why switching wins, explained so a five-year-old nods
You pick door 1. Your door holds 1 chance in 3. The dashed box, doors 2 and 3 together, holds the other 2 chances in 3. Nobody argues with this part.
Monty opens door 3. Empty, and he knew it; he was never allowed to open yours or the prize. The box does not lose its 2⁄3 just because he showed you which half of it was junk. All of it now sits on door 2.
So the choice was never “two doors, fifty-fifty.” It is: keep 1 door, or take both of the others. Switching means taking both doors, and Monty has already opened the empty one for you.
Two rounds out of three, your first pick was wrong, and on exactly those rounds the door Monty leaves shut is the prize. When Marilyn vos Savant printed this in Parade in 1990, ten thousand readers wrote in to correct her, a thousand with doctorates. The letters stopped once people played the game. The tally above does the same job.
Still arguing? Play it with a hundred doors.
Same rules, bigger room. One prize, ninety-nine empties. Pick any door.
“Go on. Any of the hundred.”
Nobody who watches Monty tiptoe around one door out of a hundred still believes it is a coin flip. Three doors is the same trick with the volume turned down.
Fold to the Moon
Take a sheet of paper, a tenth of a millimeter thick. Fold it in half. Again. The slider goes to 42, and the answer to where that lands is genuinely hard to believe.
One sheet of paper. Every fold doubles it. This is the same math as your savings account, your habits, and a pandemic.
A billion seconds
You know the words million, billion, trillion. Your brain files them next to each other like shirt sizes. Count them out loud, one number per second, and see when you finish.
A million seconds ago was last week. A billion seconds ago, the nineties. That gap is the entire difference between a millionaire and a billionaire.
Powers of ten
One slider, forty-one orders of magnitude. Drag from the inside of a proton to the edge of everything, and notice where you live on the ruler.
You are here. Hello.
A small universe
Conway’s Game of Life: four rules, no ruler. Paint some cells with your cursor, press run, and watch complexity do what it always does when nobody stops it. Markets, cities, and gossip all work this way.
Draw on it. The rules don’t care what you meant.
The armor problem
1943. Bombers come back from Europe covered in bullet holes, mapped below as dots. Steel is heavy, so you can armor only one part of the plane. Choose.
Diagram: Martin Grandjean, McGeddon, Cameron Moll · CC BY-SA 4.0
Look carefully at where the holes are. Then think hard about which planes you are looking at.
“CAPITAL”
Machines about money: compounding, shrinking, streaks, herds, a short that can ruin you, and an option that melts while you hold it.
The compounding machine
Two people start today. One gets 1% better every day, one gets 1% worse. Drag the days and watch the gap become the whole game.
The curves are identical for weeks. Then they aren’t. That flat early stretch is where almost everyone quits.
The shrinking hundred
Inflation never mugs you; it pickpockets. Set a rate and a number of years, then watch what your hundred quietly becomes while it sits somewhere feeling safe.
Rule of 72: at 3%, prices double every 24 years. Your cash does not.
The honest coin
A perfectly fair coin, flipped a hundred times. Watch how long the streaks run, then remember every market chart you’ve ever been told a story about.
Press the button. The coin has no memory; you do. That’s the problem.
The patience market
A market that only exists on this page. Buy in, watch it breathe, and sell whenever your nerve runs out. One catch: after you sell, the chart keeps going without you, and it will tell you exactly what leaving cost.
Temperament, measured in seconds. Most people don’t last a minute.
Venture odds
Most startups return nothing; a rare few return everything. Choose how many bets to spread your fund across, then run a thousand parallel futures and see how your decade could have gone.
One bet is a lottery ticket. Twenty is a strategy. Same odds, very different sleep.
The herd
Two hundred and forty traders, each watching their neighbors. The dial controls how much they care what everyone else is doing. Turn it up slowly and watch a calm market learn to stampede.
At low herding, the crowd cancels itself out and the price breathes. Push past 70 and individuals stop existing.
The rich get richer
A network grows one newcomer at a time. In a fair world, newcomers connect at random. In the real one, they connect to whoever is already connected. Run both and watch what the second rule does to the map.
This one rule, preferential attachment, explains platform monopolies, citation counts, follower graphs and the size of cities. Nobody planned any of them.
The generous coin
I flip a fair coin. Heads, you win $150. Tails, you lose $100. One flip, real stakes, decide now.
The math says this coin pays you $25 per flip, on average. Your amygdala is not consulting the math.
The short squeeze
You are short 100 shares of a fashionable stock at $100, with $10,000 in the account. The trade is probably right. The word probably is about to cost you sleep. Cover whenever you like; your broker will cover for you if you wait too long.
A long position can lose what you paid. A short can lose more than you have. Feel the difference.
The option clock
You just bought a 30-day call option: the right to buy a $100 stock at $105. It cost $320, and most of that price is not the stock; it is time. Press start and watch what time does to it, day by day.
The gray part of the bar only shrinks. The seller of this option is at the beach, letting the clock do the work.
“THE BOARDROOM”
Four true stories you can play: a fifty million dollar email answered with a laugh, an airline saved by a stopwatch, a burger chain that is secretly a landlord, and the most expensive sip in history. You make the calls they made.
The fifty million dollar email
Dallas, autumn 2000. You run Blockbuster: nine thousand stores, sixty thousand employees, and a river of late fees. A money-losing DVD-by-mail startup flies in and offers to sell itself to you for fifty million dollars. Its name is Netflix. You are about to face every fork Blockbuster faced, in order, with the information they had. See if you can beat the timeline.
Every scene in this machine really happened. The laughter in round one is documented.
The ten minute turn
Texas, 1971. Southwest Airlines is one year old, owns four planes, and is out of money. To make payroll, the board sells the fourth plane. Then comes the decision that builds the most profitable airline in history: they keep flying the four-plane schedule with three planes. You are head of ground operations. A plane only earns money while it is in the air. Make the math work.
The industry takes 45 minutes to turn a plane at the gate. At that speed, your three planes fly 24 legs a day and the schedule promised 32. Drag the slider and find the airline.
You are not in the burger business
Chicago, 1956. Ray Kroc’s young McDonald’s is franchising fast and nearly broke; the $950 franchise fee and a 1.9 percent royalty barely cover the lights. A former Tastee-Freez finance man named Harry Sonneborn walks in with an idea so good it becomes the company. Before you meet it, take the quiz.
Where does McDonald’s actually make its money today?
The sip test
Atlanta, 1984. Pepsi is beating you on television with filmed blind taste tests, and Coca-Cola is losing share for the first time in memory. Your lab has a new, smoother, sweeter formula that wins blind sips against Pepsi and against your own century-old recipe. You have run more taste tests than any company in history. Run them yourself, then make the call they made.
The counters are waiting. Your researchers have the cups poured.
Every metric is a proxy. A sip is not a can, a can is not a habit, and a habit is not love.
“THE MIND”
Your brain ships with known bugs. These machines introduce you to yours, personally.
The marshmallow clock
The famous test, adapted for adults with cursors. Press the button and hold it for thirty full seconds. That is the entire game. I will be here, talking, the whole time.
Four-year-olds who managed fifteen minutes did better at basically everything. You get thirty seconds. Begin whenever you feel brave.
The reaction tax
Click the box, wait for it to turn orange, click again as fast as you can. Then we’ll talk about what your number means for anyone who thinks they can out-trade a machine.
A fast human needs about a quarter of a second. Exchanges resolve orders in microseconds. Do the division before your next hot trade.
The gauntlet
You liked the bomber? Here are five more rooms like it. Five scenarios, each with one correct exit and several confident wrong ones. Your reasoning is the only equipment. Score at the end.
Room one is a pitch meeting. In you go.
“OTHER PEOPLE”
Trust, coincidence and contagion. Everything that spreads lives in this wing.
The trust machine
Ten rounds against a hidden opponent. Each round you both choose: cooperate or betray. Both cooperate: 3 points each. You betray a cooperator: 5 for you, 0 for them. Mutual betrayal: 1 each. The machine has a strategy. Find it.
Round 1 of 10. The machine moves when you do.
The birthday party
How many people until two of them probably share a birthday? Everyone guesses around 180. Drag the slider, watch the odds, then actually throw the party and meet the twins.
Twenty-three people. Coin-flip odds. Your intuition just filed a complaint; overrule it.
The threshold
A forest, a match, and one dial: how densely the trees are planted. Below a certain density, fires starve. Above it, everything burns. The scary part is how thin the line between those two worlds is. Set the density, plant, then click anywhere to strike the match.
Mathematicians call the line near 59% the percolation threshold. Epidemiologists call it R₀. Marketers call it going viral. Same fire.
“THE STADIUM”
Sport is a laboratory where cowardice has a scoreboard. A penalty you must guess, a goalie you must pull, and a fourth down the math already solved.
The penalty spot
You are the goalkeeper. Ten penalties are coming. Before each shot, commit: dive left, dive right, or hold the middle. Real shooters put roughly a third of penalties straight down the middle, and real keepers almost never stand still. Let’s see why.
The crowd is watching. That fact is about to make your decisions worse.
The pulled goalie
Hockey, down one goal, clock running out. Pulling your goalie for an extra attacker helps you score and gifts them an empty net. Tradition pulls with about a minute left. Choose your moment, then play five hundred games and compare yourself to tradition.
Losing by one and losing by two pay exactly the same: nothing. Once you believe that sentence, the goalie comes out earlier.
Fourth down
Three fourth-down calls, the kind NFL coaches face every Sunday. Make each call, then see what the expected points actually said. For fifty years, nearly every coach got these wrong on purpose. Your job is to find out why.
Your headset is on. Sixty thousand people will boo the correct answer.
“TIME”
The only budget that never refills. One memory test and one dial you control.
The vanishing number
A number appears for a few seconds, then disappears, and you type it back. Every round adds a digit. Science says most humans hit a wall around seven. Prove science wrong.
Phone numbers are seven digits for a reason. Your working memory was the spec sheet.
The delegation dial
Turn the dial and hand your daily choices to the machine, one at a time. Perfectly convenient at every notch. See how it reads at the end.
All yours. Heavy, isn’t it.
“TWENTY SLOTS”
One machine that keeps score for life. You had to walk the whole lab to earn it.
The punch card
You made it to the bottom of the lab, so here is the only machine that keeps score for life. Buffett tells students to imagine a card with twenty lifetime decisions. This one is yours. Punching a slot is permanent; this page will remember. Spend one only for something real you’ve decided this year.
No undo. That’s the point.
That’s every machine.
You walked all eight wings.
The essays these toys came from live at the front door, and the rest of the collection is in the world. Come back any time; the chalk keeps, the punch card remembers.