  The favored classical variables that are promoted to quantum operators are
divided into three sets that feature constant positive curvatures, constant
zero curvatures, as well as constant negative curvatures. This list covers the
spin variables, the canonical variables, and the affine variables, and these
three topics will be briefly reviewed. In this discussion, appropriate coherent
states are introduced which are the principal items that are critical in the
unification of relevant classical and quantum realms. This analysis can also
serve to unify classical gravity and quantum gravity without any speculative
aspects..
