Code Embedded in the Floor of ANU Building

Standing in the coffee queue on the ground floor of the Marie Reay building at the Australian National University today, I accidentally decoded the floor. I was intending to scan a QR code on a poster, but pointed the camera at the polished concrete floor. To my surprise my phone interpreted the pattern of stones embed in the concrete as the number 08371140.

There are secret codes, provided by the Australian Signals Directorate, embedded in the fabric of the Hanna Neumann Building at ANU. But I wasn't aware of this happening with other buildings.