BCT Letters Volume 10: The Feline Volume — Letters 176–178

This volume collects BCT Letters 176–178 under the theme of the living geometry — where BCT meets archaeology, cats, and quantum biology. BCT Letter 176 addresses ancient acoustic architecture: the Hal Saflieni Hypogeum (3,600 BCE) as a three-mode OHC Bessel resonator carved from limestone, Stonehenge as a BCT-ACOUSTIC instrument, and the Jublains dodecahedron resolved to +1.0% from real measured data. BCT Letter 177 (BCT Felinology) establishes cats as OHC-ACOUSTIC instruments: purr frequencies 25–150 Hz match OHC Bessel bone and tissue resonance modes — cats independently discovered BCT-ACOUSTIC therapy approximately 10,000 years ago. Contributing researchers: Nyssa Cabrié and Tegan Cabrié. BCT Letter 178 (Life as Quantum Computer) addresses enzyme catalysis, photosynthesis, DNA replication, bird magnetoreception, and tryptophan superradiance as OHC Bessel quantum processes. The living world is not separate from BCT geometry. It is the geometry, expressing itself in carbon, whiskers, and purring. Zero free parameters.