Community-created
The Shapes of Ideas
by SyavashTrain your mind's eye to see the hidden shapes of ideas — when two ideas are secretly the same, when they click together like puzzle pieces, and when one small change turns one idea into another.
Library
Lesson 1
The Number Game You Already Know How to Win
You take turns grabbing numbers 1 through 9, racing to hold three that sum to 15 — so why does such a tiny game feel impossibly hard to keep in your head?
StartLesson 2
The Rumor, the Virus, and the Bank Account
A schoolyard rumor, a city-wide virus, and a quiet savings account — three stories from different worlds that somehow keep making the same shocking move, and your gut keeps getting the prediction wrong.
StartLesson 3
The Gloomy Book That Unlocked Darwin
Darwin was stuck for years. Then he read a depressing book about food shortages — and two ideas snapped together.
Locked till you take the prior lessonLesson 4
The Thermostat and the Screeching Microphone
Two machines with almost the same shape. Almost. One tiny flip separates calm from chaos.
Locked till you take the prior lessonLesson 5
The Seven Bridges That Stumped a City
A famous puzzle defeated everyone until one man erased the city itself. Discover the move that reveals any idea's shape.
Locked till you take the prior lesson