We exploit nonlinear propagation in photorefractive crystals to observe the
phenomenology associated with the collision and interaction of solitons of
different tranverse dimensions: a self-trapped stripe and a round soliton.
Along with evidence of particlelike behavior, our results indicate the eme
rgence of a new phenomenology related to the hybrid-dimensional system. (C)
2000 Optical Society of America. OCIS codes: 190.5530, 190.5330.