Ancient Millstone Slicing Technique?

The lovely folks at Rizzo’s Fine Pizza in Astoria brought out a bonus pie for us to taste on last weekend’s pizza tour and they cut it in this AMAZING pattern. I thought I’d seen all possible slicing methods but this one really blew my mind - it looks exactly like a mid 19th century millstone. Millstones are cut in such a way to maximize flour yield and quality. Rizzo’s pizza is cut to maximize deliciousness.

Here’s a photo of the pizza with a shot of a millstone I saw on the side of the road last week in Ithaca, NY.