  With the hypothesis that all independent degrees of freedom of basic building
blocks should be treated equally on the same footing and correlated by a
possible maximal symmetry, we arrive at an 4-dimensional space-time unification
model. In this model the basic building blocks are Majorana fermions in the
spinor representation of 14-dimensional quantum space-time with a gauge
symmetry $G = SO(1,3)\times SU(32)\times U(1)_A \times SU(3)_F$. The model
leads to new physics including mirror particles of the standard model. It
enables us to issue some fundamental questions that include: why our living
space-time is 4-dimensional, why parity is not conserved in our world, how is
the stability of proton, what is the origin of CP violation and what can be the
dark matter.
