We developed a method to vizualise a hydrodynamic phenomenon. The reflection of an object can be distorted by undulations of the reflector, be it a funhouse mirror or a fluid surface. Here, we used this phenomenon to visualize micrometric surface waves generated as a millimetric droplet bounces on the surface of a vibrating fluid bath. This system, discovered a decade ago by Couder et al., is of current interest as a hydrodynamic quantum analog; specifically, the walking droplets exhibit several features reminiscent of quantum particles..