Snowflakes on Christmas Cards Drawn Wrong

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In pop culture depictions, snowflakes are usually drawn inaccurately, an expert now says. Snowflakes are six-cornered, rather than the four-, five- and eight-cornered crystals typically depicted in children's books, Christmas cards and even in an ad for a science magazine.

Thomas Koop of Bielefeld University in Germany noticed the frosty mistake on a subscription advertisement for the scientific journal Nature that contained octagonal snow crystals in the background.

"Ironically it was entitled '...for anyone who loves science,'" Koop said. Bringing the irony full circle, Koop's commentary on the subject is published in the Dec. 24 issue of Nature.

Snowflakes are made of water molecules that link up via hydrogen bonds. The best and most efficient way to arrange themselves is a hexagonal crystal lattice, Koop explained. So rather than eight sides, snowflakes are bound by physical laws to take on a six-sided shape.

"The resulting hexagonal crystal lattice is the lowest energy form of water at cold ambient conditions," Koop told LiveScience. "As the molecular building blocks arrange themselves into a hexagonal structure on the molecular scale, so do snow crystals exhibit this hexagonal symmetry also on the macroscopic scale."

Even so, such sides can vary, and indeed as pop culture accurately depicts the fact, no two snowflakes are alike, at least among larger flakes.