Grafitti with a College Education

Two months ago I noticed, neatly chalked on a door in the IND Fifth Avenue station at 53rd Street, the following.

S A T O R
A R E P O
T E N E T
O P E R A
R O T A S

That, you may know, is a palindrome but not just any palindrome, it's the grandest and oldest palindrome of them all, dating back to the Romans. While the Latin words don't have much meaning what is kind of fun is they read the same left to right, going down and right to left, going up; down, left to right and up, right to left. What possessed somebody to write this pentagram on a door in the subway (it's still there) we will never know but I hope it stays up for a long time.