  The Maryland model was introduced more than 30 years ago as an integrable
model of localization by aperiodic order. Even though quite popular and rich of
fascinating mathematical properties, this model has so far remained quite
artificial, as compared to other models displaying dynamical localization like
the periodically-kicked quantum rotator or the Aubry-Andre$^{\prime}$ model.
Here we suggest that light propagation in a polygonal optical waveguide lattice
provides a photonic realization of the Maryland model and enables to observe a
main prediction of this model, namely fragility of wave localization in the
commensurate potential limit.

Optics;Disordered Systems and Neural Networks;Quantum Physics