A new geometric description for Igusa's modular form $(azy)_5$
  The modular form $(azy)_5$ notably appears in one of Igusa's classic structure theorems as a generator of the ring of full modular forms in genus 2, being exhibited by means of a complicated algebraic expression. In this work a different description for this modular form is provided by resorting to a peculiar geometrical approach. 
Alessio Fiorentino
math.AG