Is Rosa Mexicano still open? This limited chain of Mexican restaurants used to be a good choice in Union Square when Chef Roberto Santibañez was at the helm. (He’s since moved on to open his own place, Fonda, which, frequent readers of this blog will know, I think is sensational and easily merits a quick trip to Brooklyn.) One of the things that I liked best about the earlier restaurant was “Más Clavadistas,” the fountain/sculpture that dominated the main dining room -- a cascading, vertical wall of water, illuminated in saturated pink and blue and dotted with the repeated sculptural image of a man diving through space over and over again. Who needs to go to Acapulco to see these fabled cliff divers when they look so beautiful right here in midtown Manhattan?