An Artwork in Progress in Nörten-Hardenberg

Follow the magic of a magic number.

Come with us on a tour through Nörten-Hardenberg – and discover pi´s numbers lying beneath your feet.

So what is pi exactly? you may ask
Here are the experts´ definitions:
The mathematician: Pi is the number representing the relationship between the circumference of a circle and its radius.
The physicist: Pi is 3.1415927 +/- 0.0000005
The engineer: Pi is about 3

(from David Baltner: The Joy of Pi, 1999)