  We present the experimental implementation and theoretical model of a
controllable dephasing quantum channel using photonic systems. The channel is
implemented by coupling the polarization and the spatial distribution of light,
that play, in the perspective of Open Quantum Systems, the role of quantum
system and environment, respectively. The capability of controlling our channel
allows us to visualize its effects in a quantum system. Differently from
standard dephasing channels, our channel presents an exotic behavior in the
sense that the evolution of a state, from a pure to a mixed state, shows an
oscillatory behavior if tracked in the Bloch sphere. Additionally, we report
the evolution of the purity and perform a quantum process tomography to obtain
the \chi matrix associated to our channel.
