  Let B be a unital C*-subalgebra of a unital C*-algebra A, so that A/B is an
abstract operator space. We show how to realize A/B as a concrete operator
space by means of a completely contractive map from A into the algebra of
operators on a Hilbert space, of the form a maps to [z, a] where z is a
Hermitian unitary operator. We do not use Ruan's theorem concerning concrete
realization of abstract operator spaces. Along the way we obtain corresponding
results for abstract operator spaces of the form A/V where V is a closed
subspace of A, and then for the more special cases in which V is a *-subspace
or an operator system.
