"NG 10 Years" competition: RESULTS !!!https://nikongear.net/revival/index.php?topic=11252.0Current status: 88/150 supporters
There's 13 levels of marble stones (including the larger base), and 13 marble stones across (above the shade). Just a coincidence? One of the horizontal marbles is half-height, they could have selected to use 12 thicker layers.
A salute to Jose Perez Toledo
Painting a deliberate 13
Along the roadside!