The Strong CP Problem as a Pentagonal Selection Rule:

The strong CP problem---why the QCD vacuum angle $ heta_{\mathrm{QCD}}$ is experimentally consistent with zero ($| heta| < 10^{-10}$) despite no known symmetry reason---has motivated decades of axion searches. We show that within the Microtubule Rendering Framework (MRF), $ heta_{\mathrm{QCD}} = 0$ is an \emph{exact} consequence of pentagonal geometry. The stable collapse