The stones in the Great Pyramid are fit together with a tolerance of about two millimetres – that’s roughly the width of a standard pencil lead. In contrast, today’s CNC machines can achieve tolerances down to a few thousandths of a millimetre, or even micrometre levels, by using servo‑controlled feeds and laser‑sawing. It’s fascinating that the ancient builders managed to reach that level of precision using only hand‑sawed blocks, rope‑measures and a lot of manual labour. Their stability comes from the massive weight and the way the blocks interlock, whereas modern machining relies on feedback loops and digital controls. Both achieve stability, but by very different means.