> This frame takes my breath away:
> I don't see how that could be a hand-worked
> surface. The striations are straight, parallel,
> equally spaced, and I see no obvious segmentation.
> No overlap, no curves. It looks like a single
> machined surface. The only apparent deviation from
> perfect parallel is an optical illusion that's
> caused by the perspective from the camera being
> located toward the bottom of that tooled face. But
> when you compensate for the perspective viewpoint,
> it certainly looks like a smoking gun for a
> machined surface.
> Alternatively, I'm wondering if it could be
> ancient troweled adhesive that once held a layer
> of valuable surface material that has since been
> lost or pilfered. There does seem to be a lot of
> relatively modern hacking amidst what clearly
> seems to be darker, older stonework.
Modern Class C tools. Metal.
Modern Class C tool. Stone. (Drag resurfacing of road).