Misc
Visualized: How Snowflakes are Formed
The Art of Snow
If you look at snow up close, you will probably notice that it is made up of thousands of tiny flakes with beautifully complex designs.
These snowflakes are actually ice crystals. They form in our atmosphere, high in the clouds, and transform along their journey to Earth thanks to different factors and forces.
We look at how snowflakes are formed, and what atmospheric conditions contribute to the beautiful intricacies we’ve come to know them for.
How to Build a Snowflake
The designs of snowflakes are actually products of a crystallization process that is controlled by the atmosphere.
Water vapor in the atmosphere latches onto a free-floating speck of pollen or dust and acts as a nucleator . This means that it can begin to add on (ie. nucleate) more water molecules and grow in size. When this happens at cold temperatures, water also freezes and crystallizes.
Despite the many unique styles of snowflakes, they all crystallize in the exact same shape—a hexagon. The reason for this has to do with how water behaves at the chemical level. At room temperature, water molecules flow randomly around each other, forming and breaking bonds endlessly.
When temperatures cool , however, they begin to lose kinetic energy and form more stable bonds. By 0°C, they reorient themselves into an energetically-efficient position, which happens to be a rigid, hexagonal configuration. This is frozen water, or ice.
All snowflakes nucleate and crystallize this way. As more water molecules nucleate to the infant snow crystal, they crystallize long arms and branching tendrils, forming unique, artistic designs.
How these designs materialize is simply a matter of water availability and temperature, a relationship best described in the Nakaya Diagram of Snowflakes.
The Nakaya Diagram of Snowflakes
In the 1930s, Japanese physicist Ukichiro Nakaya created the first artificial snowflakes and studied their growth as an analog for natural snow crystal formation. The Snow Crystal Morphology Diagram, or the Nakaya Diagram , is his handy chart that illustrates how snowflakes are formed.
The diagram illustrates the kinds of snowflakes that form via atmospheric temperature and humidity during a snow crystal’s fall to the ground.
Snowflake size and complexity depend on the humidity of the atmosphere. More water means larger, more intricate snowflakes.
Surprisingly, snowflakes cycle between two classes of growth (plates vs. columns) as temperatures decrease.
Close to its 100-year anniversary, this detail of the Nakaya diagram still puzzles researchers today. Many continue to theorize and demonstrate how this phenomenon may be possible.
Start the Same, Finish Different
You might be wondering how it is possible that no two snowflakes are identical if they all have a hexagonal inception and can form only columns or plates.
The answer lies in the dynamic nature of the atmosphere.
The atmosphere is constantly changing. As each second goes by, temperature, humidity, wind direction, and a number of other factors bombard a snow crystal as it falls to the ground.
Snow crystals are sensitive to the tiniest of these changes. Water vapor that is crystallizing responds to different exposures which ultimately make new patterns.
Since no two snowflakes travel in the exact same path at the exact same time, no two snowflakes will look the same. Same start, different endings.
Misc
Vintage Viz: China’s Export Economy in the Early 20th Century
This pie chart, circa 1914, is a fascinating breakdown of China’s export economy just prior to World War I.

Vintage Viz: China’s Export Economy in the Early 20th Century
“The past is a foreign country; they do things differently there” is the oft-quoted first line of L.P. Hartley’s 1953 novel, The Go-Between .
A statement that is as profound as it is banal. In other words, when we do history, we’re a bit like tourists. If we really want to understand the past, we have to think like a local.
The infographic above, Aspects of Principal Exports of Chinese Goods to Foreign Countries , is the first in a series that we’re calling Vintage Viz , which presents a historical visualization along with the background and analytical tools to make sense of it.
Today, the People’s Republic of China is the second largest economy in the world, a permanent member of the UN Security Council, and a growing military power . But at the dawn of the 20th century, things were much, much different.
Opium and the Opening of China to the West
Early Sino-Western trade was restricted by the Qing emperors to three ports, and after 1757, just one, in what became known as the Canton System. This name came from the one remaining port city of the same name, present-day Guangzhou.
Foreign trade was tightly monitored and subject to stiff tariffs, and Western traders chafed under these restrictions. So when in 1839, Chinese authorities moved to shut down opium smuggling—an important source of profit for foreign merchants—Western powers saw their chance and used the pretext to revise the terms of trade by force.
In what became known as the Opium Wars, 1839-1842 and 1856-1860, first Great Britain and then an Anglo-French alliance defeated imperial China and imposed punitive treaties that included indemnities and lowered tariffs, but also expanded the number of ports open to foreign traders, first to five and by 1911, to more than 50.
Westerners were exempted from local laws, Christian missionaries were allowed to proselytize freely, and the opium trade was legalized. Hong Kong was also ceded to Great Britain at this time.
The Treaty Port Era, also known as the Century of Humiliation , was perhaps too much for the country to bear. The weakened central government was beset by popular unrest, including the Taiping Rebellion (1850–64), which killed 20 million people, and the Boxer Rebellion (1899-1901), so-named for the secret society that led the movement, the Righteous and Harmonious Fists.
Eventually, the last Chinese emperor was deposed and a republic declared in 1911. Nevertheless, the government was too weak to impose its will, and was repeatedly challenged by warlords.
So as we approach the outbreak of the First World War in 1914, and the period covered by our visualization, we find China weakened internally by civil strife, and externally by Western powers.
The History of this Century-Old Pie Chart
Aspects of Principal Exports of Chinese Goods to Foreign Countries captures Chinese exports for 1914, and comes from The New Atlas and Commercial Gazetteer of China: A Work Devoted to Its Geography & Resources and Economic & Commercial Development .
Originally published in 1917 and edited by Edwin J. Dingle for the Far Eastern Geographical Establishment, the volume contains a wealth of data for the period. According to the book’s Preface, it “seeks to give all the information that is essential to the business-man in regard to a country… about which less is known than in regard to any similar area in the world.”
The visualization breaks down total Chinese exports for 1914 in haikwan taels (hk. tls.), a unit of silver currency used to collect tariffs. In 1907, one haikwan tael was worth $0.79 U.S. dollars.
Official figures come from the Chinese Maritime Customs Service . This was set up by foreign consuls after the First Opium War to collect tariffs to guarantee the payment of treaty indemnities.
Exports in 1914 represented 345 million hk. tls., a 14.4% decrease from 1913, likely owing to the outbreak of the First World War that same year.
Apart from “Other Metals and Minerals, Sundries, etc,” which served as a catch-all category, the largest categories were silks and teas of various types, representing 22.6% and 10.4% of total exports respectively.
Export Item | Value (hk. tls.) |
---|---|
Animals, Living | 5,270,910 |
Beancake | 21,734,135 |
Bristles | 4,347,582 |
Coal | 8,624,805 |
Cotton Goods | 2,012,128 |
Cotton, Raw | 12,339,549 |
Eggs, Fresh, Preserved and Frozen | 4,192,535 |
Fire crackers and fire works | 2,435,841 |
Grasscloth | 1,422,727 |
Mats and Matting | 3,326,819 |
Medicines | 2,672,341 |
Oil, Bean and Nutgalls | 6,027,967 |
Oil, Groundnuts | 2,414,900 |
Oil, Wood | 3,736,275 |
Opium, Chinese | 250,255 |
Other Metals and Minerals, Sundries, etc | 74,449,181 |
Paper | 2,864,983 |
Ramie | 1,664,463 |
Seed, Rape | 2,662,349 |
Seed, Sesamum | 6,355,317 |
Sheep’s Wool | 6,658,962 |
Silk Cocoons | 2,078,721 |
Silk Piece Goods | 10,841,472 |
Silk Pongees | 4,720,914 |
Silk Waste | 5,025,679 |
Silk, Raw, not Steam Filature | 2,811,367 |
Silk, Raw, White, Steam Filature | 37,384,485 |
Silk, Raw, Wild not Filatures | 4,072,777 |
Silk, Raw, Yellow Steam Filatures | 1,267,413 |
Silk, Raw, Yellow, (not Steam Filature) | 4,439,073 |
Silk, Re-Reeled | 5,552,127 |
Skins and Hides Undressed (Cow and Buffalo) | 13,499,340 |
Skins, Goat Untanned | 3,207,974 |
Straw Braid | 1,104,310 |
Tallow, Animals and Vegetables | 3,175,270 |
Tea Brick, Black | 6,711,019 |
Tea Brick, Green | 2,323,259 |
Tea, Black | 16,203,547 |
Tea, Green | 10,785,584 |
Timber | 1,820,273 |
Tin, in Slabs | 7,978,558 |
Vermicelli Macaroni | 1,957,827 |
Wheat | 3,850,179 |
Yellow Beans | 19,005,709 |
Total | 345,280,901 |
Below are some more details that emerge from this visualization.
All the Tea in China
The Chinese tea trade was the subject of another visualization in the Atlas. It shows that China had been steadily losing ground to British India. Between 1888-1892 Chinese exports to Great Britain were 242 million pounds against India’s 105 million pounds. By 1912-1913, India had surpassed China to export 279 million pounds against 198 million pounds.
In 1914, the majority of Chinese exports went to Russia, 902,716 piculs in all. A picul is equal to “as much as a man can carry on a shoulder-pole” or about 133 pounds.
The Silk Road to Profits
Silk has long been in demand in the West as a luxury good, giving its name to the overland trade route that connected East and West for centuries: the Silk Road.
In 1914, China was the largest producer and exporter of silks in the world. On an annual basis, China averaged 14 million pounds, compared to the number two spot, Japan, at 11 million pounds, and number three, Italy, at 9 million pounds. Together, these three controlled 81.7% of the global silk trade.
The Opium of the Masses?
The opium trade, the pretext that opened China to foreign trade, was still big money in 1914.
A total of 37 million hk. tls. were imported in 1914 from India, up 11.9% from 1908. This is actually down from a peak of 41 million hk. tls. in 1913.
In 1907, China signed the Ten Year Agreement with India, which ultimately phased out the opium trade. By 1917 the trade was all but extinguished.
Back to the Future
The Aspects of Principal Exports of Chinese Goods to Foreign Countries is a far cry from the contemporary trade picture. China’s top export in 2021 was in the category “telephones for cellular networks or other wireless networks,” and was worth $147.1 billion .
But it’s worth noting that China today is a direct result of this period. The resentment created during the Century of Humiliation would eventually help lead to Mao Zedong, the Long March, and the establishment of the People’s Republic of China.
And in 1979, the Chinese central government would set up the first of their own “treaty ports,” in the form of special economic zones, places where foreign companies could set up shop. But this time, it wasn’t foreign powers who were making the rules.
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