VERY interesting presentation of details on how the nested spheres were carved, with some surprising results, e.g.: layers 1, 2, 3, 4, 5 are clearly visible l

VERY interesting presentation of details on how the nested spheres were carved, with some surprising results, e.g.: layers 1, 2, 3, 4, 5 are clearly visible layers 6, 7, 8 and 9 are carved ‘blindly’