A book so long,
it needed to unfold
It began with a book — 《中国历史长卷：手绘年表》, a Hand-Drawn Timeline of Chinese History published by Stepbooks. Not a typical history book. This one unfolded into a scroll more than six meters long, tracing an unbroken thread of Chinese civilization from its earliest records to the present day.
Chinese history is vast — over 3,000 years of uninterrupted written record, dynasty after dynasty, emperor after emperor. Reading it without a map is like navigating a city without street signs. Events blur together. People appear in the wrong centuries. The famous joke in China: "Guan Yu fighting Qin Qiong" — two generals separated by 600 years, yet easily confused in the popular imagination.
The timeline was a coordinate system. It put all of Chinese history in its proper place — and suddenly, everything made sense.
Not tea.
Not another notebook.
The gift problem comes every year. You want to give something thoughtful — something that says you actually know the person. But the shelves are full of the same things: tea, notebooks, decorative magnets. Beautiful, perhaps. Forgettable, certainly.
Staring at the unfolded timeline of the book one afternoon, a thought arrived: what if a single dynasty — say, the Song — could be held in your hand? Its emperors laid out in sequence. Each centimeter a decade. Each millimeter, a year. You could actually feel the weight of time.
The first prototype was a calligraphy paperweight. Something to hold down paper while you practiced ink and brush — but also something to look at, to read, to wonder about. The Han Dynasty. The Tang. The Ming. Each one a sliver of history made tangible.
One millimeter equals one year. The longer the emperor's reign, the more space he takes on the ruler. You can feel history.
If time fits on a ruler,
why not make a ruler?
The paperweights worked beautifully. But a paperweight sits on a desk and waits to be noticed. A ruler goes everywhere. It comes out for every homework assignment, every drawing, every measurement — in school, at home, in a backpack. It is perhaps the most used object in a student's life.
And here was the remarkable thing: the scale was already perfect. One millimeter per year. The Spring and Autumn period, 770–476 BC — exactly 294 years, exactly 294 millimeters, a standard 30cm ruler. History and measurement were the same thing.
So we made rulers. Fourteen of them — twelve straight rulers for China's major dynasties, and two set squares for the brief but pivotal Qin and Sui dynasties, paired visually with the Han and Tang that followed them. Han承秦制。唐承隋制。 The Han inherited the Qin system. The Tang inherited the Sui. The set square shape made that relationship visible at a glance.
From China to California —
and the rest of the world
In California, surrounded by a different history — the Gold Rush, the founding fathers, the Civil War — the same question arose. Could American history wear a ruler too? Could a child measure a line in math class and, glancing down, see Lincoln and Jefferson laid out beneath their pencil?
The answer was yes. The U.S. History Ruler was born — 26 centimeters carrying 250 years, from the Declaration of Independence to the present, with all 47 presidents and seven eras mapped across its surface.
And if America, why not the world? The World Civilization Ruler followed — 5,500 years across six civilizations, from ancient Sumer to the modern era. The Nile and the Yangtze, Rome and the Han, the Maya and the Mughal — all visible at once, all in proportion, all in your hand.
"Hold the world in your hand." It was no longer just a tagline. It was literally true.