◌ ONE ORIGIN The story · Shifting the frame

✉️ SHIFTING THE FRAME · MIGRATION RECEIPT

The Reverse Migration Postcard

Pick your city on the map, type it, or enter coordinates. The route runs back from there to the Great Rift Valley, and the receipt changes with your pace: how far you walk each day, how many days a year you are on the move, and how long a generation lasts. The real journey was never straight.

A vintage postcard with a thin line drawn from a coastal city back to a rift valley.
One unbroken line home.

Pick a city — five from every continent

Rift Valley

Click the map to start the route from that place, or type a city above.

5 km a day
365 days a year
25 years

City coordinates are built in (136 cities; you can also enter “lat, lon”). Distance is a great-circle model from the Lake Turkana basin of the Great Rift Valley; the nonstop walk assumes the pace you choose every day of the year. Generations are years divided by the generation length you choose. The out-of-Africa figure (~65,000 years) is the dispersal date in the footsteps dataset. The land outline is Natural Earth 110m (public domain). The real journey took tens of thousands of years and was never straight — the receipt says so.

More ways we’re connected

Sixteen ways to put the same point — that every human line on Earth runs back to one place — in your own hands.

Your own numbers

Your birthday crowdA date you share with millions. Your family treeMore branches. Shared roots. Your place, real sizeA fairer view of somewhere you love. A moment we shareDifferent clocks. Happening together.

The deep record

Two chains, one continentMitochondrial Eve and Y-chromosomal Adam, drawn against time. The shared ancestor counterType a crowd. Find the ancestor every one of them shares. Count the hands between usFewer than 50 links separate any two people alive. Fourteen peoples, one patternStructural universals across five continents.

Shifting the frame

Footsteps of KinshipDrag 300,000 years of leaving Africa, one toolkit at a time. Root to BranchThousands of languages branching from African roots. The Deep Time MirrorYour face, aligned with the oldest skulls we have. The Deep History Time MachineWatch borders, cities and farms fade off the planet. The Great-Grandparent MultiplierYour family tree has to loop. Here is the maths. Stardust & SoilWhat you are made of, and where each atom was forged. The Borderless Night SkySame stars. Many skies. One imagination. The Reverse Migration PostcardA line from your city back to the Great Rift Valley.

Feel the pattern

The Converging RiversEvery river runs back to the Rift. Drag to pull a thread home. The Synchronized BreathOne atmosphere. Hold to slow and breathe with the globe. The Shared LexiconMama, water, fire: one breath, many scripts. The Erasure of BordersScroll to peel the modern map down to a starlit Africa. The Mirror of AgesMany shades, one composite face. Unify the spectrum.

What every human does

Everybody SingsMusic was in all 315 societies the census read. All of them. The Same FaceBorn blind, never seen a face — and the same smile on winning. Two Hundred MillisecondsTen languages, five continents, one fifth of a second.