December 23 – 357
MathMod & Morenaments. “The kiss” – Regrouping Togliatti 31 double points. Togliatti was the Italian mathematician that showed that quintic surfaces have 31 ordinary double points.
Background: Pmg symmetry – This group contains reflections and glide reflections which are perpendicular to the reflection axes. It has rotations of order 2 on the glide axes, halfway between the reflection axes.