Grand Gallery as Machine Framework

The Grand Gallery is 47meters long, 8.6meters tall, and narrows from 2.06meters at the floor to 1.04meters at the ceiling through seven corbelled courses. Twenty-seven pairs of slots (niches) line its walls at regular intervals. Christopher Dunn proposes these held resonator assemblies. The gallery's dimensions create a specific acoustic resonance pattern. The ceiling blocks of the Grand Gallery weigh approximately 70 tonnes each and are precisely fitted with ratchet-style joints. The purpose of the Grand Gallery remains one of the Great Pyramid's deepest mysteries — it is massively overbuilt for a mere passage to the King's Chamber.