See a Haaretz  story commemorating the Feb. 14,
1917, birthday of a crystallographer.

Related material in this journal —

At the Still Point (June 15, 2013):

IMAGE- The dance of Snow White and the Seven Dwarfs

The illustration is for those who, like Andy Magid and
Steven Strogatz in the March 2014 AMS Notices,
enjoy the vulgarization of mathematics.

Backstory: Group Actions (November 14, 2012).