  We investigate how the dynamics of a hexagonal prism rolling on a floor
change with friction and structural asymmetry. It is shown that the asymmetry
induces the non-reciprocal dynamics where the prism rolls only in one direction
regardless of the direction of the initial velocity. While such behavior is
primarily suppressed with increasing friction, we observe that there is a
certain range of friction coefficient where the non-reciprocity is restored.
This suggests that the friction not only diminishes the dynamics, but also
assists it by exerting a torque to the prism.
