  Parallel transport of a vector around a closed curve on the surface of a
sphere leads to a direction holonomy which can be related with a geometric
phase that is equal to the solid angle subtended by the closed curve. Since
Pancharatnam phase is half of the solid angle subtended by the polarization
cycle on the Poincare sphere, quantum parallel transport law takes recourse o
spin-half wave function to obtain this result. A critique is offered on this
factor of half anomaly in the geometric phase, and a natural resolution using
Riemann sphere polarization representation is suggested. It is argued that spin
angular momentum of photon is fundamental in polarization optics, and new
insights are gained based on the hypothesis that two helicity states correspond
to two distinct species of photon. This approach leads to the concept of a
physical Poincare sphere: nonlinearity and jumps in the Pancharatnam phase find
a simple physical explanation while novel features pertaining to the discrete
and pulsating sphere are predicted. Paired photon spin zero structure of
unpolarized light is also discussed. An outline of possible experimental tests
is presented.
