David Griffeath (University of Wisconsin-Madison) and Janko Gravner (University of California, Davis) have a computer model based on diffusion-limited aggregation that can simulate snowflakes. Their images look very real and demonstrate the wide variety of snowflakes found in nature.

Below are some of their snowflakes:

A PDF slideshow of 40 such snowflakes can be found here.

**Links**

Gravner-Griffeath Snowfakes

AMS Mathematical Imagery

## Random thoughts on mathematics, physics and moreā¦