Some ideas are easier to show than to draw. A bank run is people queuing while the vault empties. Compound interest is a pile that grows faster each year. A hurricane is warm air rising and spinning.
The explainer library now has 314 animations in 18 areas. Some are ways of explaining (shares, change, scale, time, money, systems). Others show the subject itself at work: space, the body, animals, machines, history, the mind, health, chemistry, climate, empires, markets and more. Each one moves on the narration's own words and uses the narration's own numbers.
How one is chosen. For each scene, the director is shown the animations closest to what the sentence says, in any of our languages, and picks one only when it fits. Its answer is then checked in code: the numbers must be in the narration, the arithmetic must add up, and the same animation never plays twice in a row. A scene with nothing fitting keeps its drawing.
How much it helps. On 78 real scenes in English, Arabic and Spanish, a blind judge found a clearly fitting animation among each scene's options for 53% of scenes, against 19% with the library before. The judge is an AI model, not a person, and 78 scenes is a small sample.