So… who decided that?

This is the type of really, really important stuff I spend time thinking about… 

As I was hanging our new shower curtain I wondered… who decided there should be 12 holes in the curtain?  Someone, at some point, decided to make a shower curtain with 12 holes… who were they?  Why did they pick the number 12?  Why did everyone else say “12? That’s genius! I’ll put 12 in mine too.”  Our shower curtain from Pottery Barn has 12 holes, the liner we bought from Target has 12 holes and the set of curtain rings we bought in Ireland came in a pack of 12.