There is an interesting conversation to be had here regarding the symbolism of the national American flag, and the utility/effectiveness of the the half-staff procedure. Half-Staff is a great and effective tool for millions of citizens, but maybe not hundred-millions or billions. I'm inclined towards half-staff on a contextually appropriate flag, e.g. A state or more local or non-geographic-union. But I'm also concerned with the burden of additional flags as well as the isolating effect of uniting under a flag.