This is Pi:
3.14159265358979323846264338327950288419716939937510Pi is the ratio between a circle's circumference and its diameter. It's very important.
It's also the birthday of photographer Diane Arbus.
From At Get Photography:
In a working life less than a decade Diane Arbus effected a profound reconsideration of photography's intensions. Her work turned away from the central concerns of the preceding generation. She valued psychological above formal precision, private above social realities, the permanent and the prototypical above the ephemeral and the accidental, and courage above subtlety. These intuitions were pursued with acute intelligence and fierce dedication --- the latter almost perfectly concealed by humor, and a precisely calculated measure of self-deprecation.This is Arbus:
She altered our experience of the face.