  Using coherent states and linear optics, we demonstrate the synthesis of
arbitrary interference patterns and establish that neither the shape nor the
visibility of N-photon interference patterns can be used as a quantum signature
in general. Specific examples include saw-curve and rectangle curve
interference patterns, and phase super-resolution with period shortening of up
to 60 times compared to ordinary interference. The former two with a visibility
close to 100 % and the latter with a visibility in excess of 57 %.
