Figures are computed, never drawn
Books you can pull the curves out of
The figure does not illustrate the lesson. It works it out, while you watch, from the same few lines of mathematics the lesson is about.
What is actually in them
A hundred and two kinds of figure, every one of them alive
One page, read slowly
- 01
It starts as a book.
A physics textbook — the one every pupil in terminale carries.
- 02
Open it, and it asks a question.
At what angle does a thrown ball land furthest? On paper, you would take the answer on trust.
- 03
The figure arrives, and it is live.
Axes, like any textbook's. But it runs the lesson's own equations.
y = x·tan θ − g·x² / (2v₀²·cos²θ) - 04
It works the problem out, point by point.
Thrown at 30°, every position is computed from the lesson's own equation.
θ = 30° → R = 14.2 m - 05
Then 60° — and it lands in the same place.
Not a coincidence: sin 2θ is the same for both. The figure found that; nobody drew it.
θ = 60° → R = 14.2 m - 06
45° goes furthest. That is the answer.
A textbook that does the mathematics while you read it. That is the whole idea.
θ = 45° → R = 16.4 mOpen this book
Manuel du Baccalauréat
Physique — Chimie
Then, the notebook
- 07
Then it goes into the notebook.
Le Jaguar is the pupil’s own notebook, and it sits right beside the book.
- 08
Open it on real paper.
Séyès ruling, the kind in every schoolbag — drawn, not photographed.
- 09
Turn to today’s page.
Last lesson on one side, a fresh page on the other — ready for the figure.
- 10
Clip the figure out of the book.
It lands on the page still live, and it keeps its address: one tap, and you are back on page 113.
- 11
Write around it.
Your own words next to the working: 30° and 60° land together, 45° goes furthest.
- 12
Stuck on a word? The jaguar comes.
Select it, and the dictionary and Wikipedia answer in its bubble. Everything stays on your device.
Open Le Jaguar
Le Jaguar
NomBenali
PrénomSalma
Classe1re S2
Physique — Chimie96 pages · Séyès
Ce cahier appartient à
Salma Benali
1re S2 · 2026 – 2027
lundi 10 mars
Chapitre 4 — Mouvement dans un champ
Dans le champ de pesanteur : a = g, constante.
(la masse ne compte pas !)
Équations horaires :
x(t) = v₀ · cos θ · t
y(t) = v₀ · sin θ · t − ½ g t²
La trajectoire est une parabole.
What it does, in five moves
01Read
A figure that works it out while you watch.
Every figure in a Fable book is computed on the page from the lesson's own equations. Move a value and the answer follows — the same mathematics the chapter is about, not a picture of it.
02Take notes
Clip any passage into a real notebook.
Le Jaguar is a pupil's notebook on Séyès ruled paper. Lift a paragraph or a figure out of any textbook, annotate it, and it keeps its address — one tap takes you back to the page it came from.
03Experiment
Run the experiment, not a video of it.
See for yourself lifts the simulations out of the books. Set the values, run it, and watch what the equations do — including the cases no textbook had room to print.
04Write
Build a textbook from blocks.
Studio assembles a chapter from 102 kinds of block — a map, an orbit, a circuit, a quiz — and builds the whole book into one HTML file that opens anywhere, the school's oldest laptop included.
05Measure
See exactly where pupils stop.
A trial copy reports how a book is read: the chapter abandoned two thirds of the way down, the figure taken for a button, what breaks on their phone. Never what they write.
And two things to read with
A pupil's notebook on real Séyès ruled paper. Clip a passage out of any textbook, annotate it, keep it. Everything stays on this device and no account is asked for.
Open the notebook › See for yourselfThe simulations on their own, outside any book — set the values, run it, watch what the equations actually do.
Open the simulations ›Behind it
Fable is one person’s work so far: an engine that builds these books, a studio where teachers write them, the notebook and the simulations. Everything on this site came out of it. The project page says what exists, who it is for, and what it would take to put it in front of every pupil.