The things you learn...

I've been reading the Megillah for who knows how long, including three times this Purim alone. And only on the third time, today, did I notice something interesting: Shushan Purim is treated as the norm, and "regular" Purim is something "all those other people do." Maybe it's because the book was written in Shushan, and I'm probably noticing it because this is the first time I'm celebrating Shushan Purim, but there you are.