Mathematics - In the Park?

Introduction

I have often advocated that a mission of mathematicians is to help people to "see, seek, and speak" mathematics [Campbell 2002]. Doing so can be a matter of pointing out features in nature (e.g., Fibonacci sequence in sunflowers) or discerning patterns in human artifacts (e.g., symmetries on car wheel covers) [Campbell 2013, 721].
Rarely is the mathematics as "planted" as one can find amid the gardens on the grounds of Sch®onbrunn Palace (Schlo√ü Sch®onbrunn) in Vienna. There, in the Labyrinth area, set into the ground is a square of numbers, shown in Figure 1 and more plainly in Figure 2.