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# Two Hundred Thousand Snowflake Greetings to You and Yours

Take Stephen Wolfram’s theory of the universe, add a dash of symmetry, and what do you get? Snowflakes.

Cellular automata—the basis of Stephen’s theory—typically operate on rectlinear grids. But with suitable automata rules and a simple geometric transformation, you can achieve patterns with six-fold dihedral symmetry, the symmetry of snowflakes.

My colleague Ed Pegg Jr. showed that idea nicely in his Demonstration “Snowflake-Like Patterns”. I started with his Demonstration; added some ideas from Matthew Szudzik’s related Demonstration, “Snowflake Growth”; and fine-tuned the rendering to recall Bentley’s classic snowflake photos, arriving at this interactive snowflake generator.

I haven’t had time this morning to explore all 233,280 snowflakes contained in this little program, but I have discovered that there are some real surprises in there. Like rule 3174, which explodes in snowflake fireworks as you animate the steps from 1 to 64. Or the closed, self-avoiding curves of 3649 and 3313. Or 3516, like an intricate snowflake pattern on a Scandinavian winter sweater.

There are many more gems in there, and you can help find them. If you haven’t done so already, install the Wolfram CDF Player browser plugin so the controls above come to life. Explore the possibilities, and if you find something interesting, send us a comment below with the coordinates of the snowflake, for example, {3313, 51} for rule 3313 at step 51. We’ll append images of the reader-supplied snowflakes to the post. Supply a title too, if you like. My colleague Andrew Moylan christened the initial {2653, 64} snowflake above “Dinner for Six.”

Here are some tips for easier exploring: enter a rule number directly by clicking the “+” icon to the right of the slider and typing in the input field. Press the Alt or Option key while dragging the sliders for fine control, and additionally Shift for even finer control.

From us and ours at Wolfram Research to you and yours, best wishes for the winter holidays. We’ll see you in the new year.

 {1517,54}Nik, December 29, 2011 Fine Web, {2633,64}Cetin Sert, December 29, 2011 Dinner for Six, {2653,64}Andrew Moylan, December 28, 2011 Candy Bowl, {1708,64}Andrew Walters, December 29, 2011 {3432,64}Marcello, January 9, 2012 Dancing Figures, {3394,57}Vitaliy Kaurov, January 11, 2012 Dew in Spider Web, {1338,64}Vitaliy Kaurov, January 11, 2012 Turbine, {946,64}Vitaliy Kaurov, January 11, 2012 Holding Hands, {1088,64}Vitaliy Kaurov, January 11, 2012 Harmonic, {349,69}LaVerne Poussaint, January 13, 2012 Chandas, {2047,69}LaVerne Poussaint, January 13, 2012 Time and Eternity, LI, {3174,58}Brad Klee, February 2, 2012