  The algebra su(2) is derived from two commuting quon algebras for which the
parameter q is a root of unity. This leads to a polar decomposition of the
shift operators of the group SU(2). The Wigner-Racah algebra of SU(2) is
developed in a new basis arising from the simultanenous diagonalization of two
commuting operators, viz., the Casimir of SU(2) and a unitary operator which
takes its origin in the polar decomposition of the shift operators of SU(2).
