Frieze Pattern freeze pattern snowflake

 

 

http://mathworld.wolfram.com/FriezePattern.html

 

http://www.nrich.maths.org/public/viewer.php?obj_id=1349&part=index&refpage=similarproblems

 

http://server1.fandm.edu/departments/mathematics/a.crannell/hm/Math/frieze.html