  We describe an accelerating universe model in the context of a scalar-tensor
theory. This model is intrinsically closed, and is filled with
quintessence-like scalar field components, in addition to the Cold Dark Matter
component. With a background geometry specified by the
Friedman-Robertson-Walker metric, we establish conditions under which this
closed cosmological model, described in a scalar-tensor theory, may look flat
in a genuine Jordan-Brans-Dicke theory. Both models become indistinguishable at
low enough redshift.
