If you'd bother to watch the video, he (Ben with UnchartedX) explains that it would be impossible to create these things on lathes, even modern ones. He's made several videos on this subject so far, because of how astonishing it is.

You can't lathe granite, as it is incredibly hard and has occlusions in it which will break under a lathe. Softer rocks, maybe, but not granite, or the other harder rocks that were used to make these pieces. Furthermore, all of these vases have handles, and even the curves between and part of the handles are insanely accurate (within a few microns of accuracy). There's also been further analysis of the 3D scans of some of these vases (this project only started a few months ago, by the way, and these are only the first few vases they've scanned), showing that all of the measurements and curvatures are mathematically related, often in relation to mathematical and geometric constants, even among the smallest curves in the handles, where the radii are less than 1mm. They're so accurate they can't be made by hand, and the only way we can make them today is with the best computer driven machines with multi axis capabilities, utilizing computer driven software. Even then, most modern machines introduce more error into their work than is seen in these vases, just from a simple tool change, which would be required to replicate these vases.

Truly, these vases could only be produced in a computer, with design software, and manufactured with highly precise sophisticated machines, which we have trouble replicating today...and there's tens of thousands of these vases. I've worked with rock before, for years, by hand, with hammers, chisels, saws, polishers, and other machinery. If anyone thinks these vases can be made by hand, they're deluded.

If you'd bother to watch the video, he (Ben with UnchartedX) explains that it would be impossible to create these things on lathes, even modern ones. He's made several videos on this subject so far, because of how astonishing this is.

You can't lathe granite, as it is incredibly hard and has occlusions in it which will break under a lathe. Softer rocks, maybe, but not granite, or the other harder rocks that was used to make these pieces. Furthermore, all of these vases have handles, and even the curves between and part of the handles are insanely accurate (within a few microns of accuracy). There's also been further analysis of the 3D scans of some of these vases (this project only started a few months ago, by the way, and these are only the first few vases they've scanned), showing that all of the measurements and curvatures are mathematically related, often in relation to mathematical and geometric constants, even among the smallest curves in the handles, where the radii are less than 1mm. They're so accurate they can't be made by hand, and the only way we can make them today is with the best computer driven machines with multi axis capabilities. Even then, most modern machines introduce more error into their work than is seen in these vases, just from a simple tool change, which would be required to replicate these vases.

Truly, these vases could only be produced in a computer, with design software, and manufactured with highly precise sophisticated machines, which we have trouble replicating today...and there's tens of thousands of these vases. I've worked with rock before, for years, by hand, with hammers, chisels, saws, polishers, and other machinery. If anyone thinks these vases can be made by hand, they're deluded.