Bluebulb Projects' The Measure of Things presents:
13 is about one-one-hundred-fiftieth the number of Steps in the Sears Tower.
In other words, it's 0.006164 times the count of Steps in the Sears Tower, and the count of Steps in the Sears Tower is 162.20 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (steps per stairwell)