  We experimentally investigate the structural behavior of an interacting
colloidal monolayer being driven across a decagonal quasiperiodic potential
landscape created by an optical interference pattern. When the direction of the
driving force is varied, we observe the monolayer to be directionally locked on
angles corresponding to the symmetry axes of the underlying potential. At such
locking steps we observe a dynamically ordered smectic phase in agreement with
recent simulations. We demonstrate, that such dynamical ordering is due to the
interaction of particle lanes formed by interstitial and non-interstitial
particles.
