Pi Day 2015 has come and gone. Word was this one was distinctive in that 3.1415 could also be taken to stand for March 14, ’15, something that happens once a century. A Saturday this year, meaning we were mostly at home doing nothing related to pi. Which would have been the case any other day of the week, come to think of it. But it’s one of those days that’s good to note in passing.

Lilly had a shirt for the occasion, sold for a not-too-outrageous cost by the high school math club or some such.

An aggressive Pi, that one. Pushy Pi. Here are other representations of everyone’s favorite irrational number. Too bad for e, always second banana to pi. E Day would be Feb 7, but that’ll never catch on.