Abstract
THE frequently portrayed beautiful six-ray star-shaped crystals of snow have long been quoted as outstanding examples of well-developed crystal forms. Despite an infinite variety in the patterns which appear, there does often exist a remarkable symmetry in the six rays, the complex tree-like pattern repeating closely in each arm, indeed, surprisingly so. Since each of the six arms of the crystal would appear to be growing independently, this symmetry poses a problem in crystal growth, for it almost seems as if each arm of the six-ray star ‘knows’ what the other five are doing and follows suit. In fact I believe that each arm does ‘know’ what the others are doing and I offer the following explanation.
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