A published surface-characteristics study reports an Rz roughness of 9.49 μm on the polished granite walls of the Barabar caves. The video says the finish is about nine times smoother than industrially polished marble and nearly as precise as window glass, while the chambers show millimetre-level geometric accuracy. It argues that producing the complex shapes would have required advanced geometry, including working with π to many decimal places, and notes that no known workshop or training site has been identified. The caves are Mauryan-period rock-cut monuments from around the third century BCE, roughly 2,300 years ago.
Study reports exceptional smoothness in Mauryan-era Barabar caves
IndiaExcavation
Key facts
- A published surface-characteristics study reports an Rz surface-roughness value of 9.49 μm for granite surfaces at the Barabar caves and describes a polished finish.
- The Barabar caves are Mauryan-period rock-cut architecture, generally dated to around the third century BCE, roughly 2,200–2,300 years ago; they are not 'cave art' in the usual painted-art sense.
- The 9.49 μm Rz value measures local surface roughness; it does not by itself establish the dimensional accuracy of the entire chambers.
- The video describes the walls as both smooth and flat and compares the finish and chamber geometry with industrially polished marble, window glass and modern engineering tolerances.
- The video argues that producing the complex shapes would have required advanced geometry, including working with π to many decimal places. This is the presenter's interpretation, not a measured finding.
- The video says no known workshop or training site for the workers has been identified.
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Barabar Caves: Geometry, Granite, and a Mystery We Still ...simplyextensionsandlofts.com
The Oldest Rock-Cut Caves in India — and Still the Most Precise. Hidden in the granite hills of Bihar, India, the Barabar Caves are over 2,200 ...
Barabar Cavesen.wikipedia.org
Sudama Cave (9.98x5.94m) has a large vaulted room and a semi-hemispherical sanctum (not in photo), with a polished granite finish. The cracks are from a ...
Ancient Perfection: The Mystery of the Barabar Caveshistoricmysteries.com
The Barabar Hill Caves are some of the oldest surviving rock-cut caves found in India, around 40km (25 miles) from Bodh Gaya in the state of ...
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