A net to constrain the brain

Reticle, derived from the Latin for "net". Refers to what is commonly know as "crosshairs." Werner Herzog pushed his table up against the wall and, facing its blank whiteness, drew a reticle to stare at while he worked on the script for Fitzcarraldo.

Is it frivolous of me to wonder if he drew a German #1, German #4, or an Illuminated German #4 reticle?