The assignment was to design support for the installation of "El Sireno del Río de La Plata" a photograph of merman on the dock of the Old Port as an indicator of the level of the tides. The piece would be subject to the thrust of the waves, drifting objects (boats) and it is a bathing place. Instead of facing the sea with a heavy piece, rigid, inappropriate for support of sandstone, (which deteriorates naturally) handsome photography inspired by a flexiblestructure merman tail, consisting an structure of tubes with wires strung to play with waves and the whole of life endowment with a movement that cushions the thrust of the sea.