In its Sixties prime, the North Shore Band Shell provided the setting for a television variety program. In fact the Mike Douglas Show logos can still be found in a dressing room. Recently, in an effort to build a sense of community among residents, Miami Beach officials revamped the shell and began sponsoring an array of activities: jazz bands, symphony orchestra performances, an Afro-Caribbean festival. On Friday nights the terrazzo dance floor becomes a roller rink. On Sunday nights seniors dance to a live band playing the hits of yesteryear. The multihue structure has stood its ground in the face of changing cultural tides, a fact made clear on the nights when the shell is spotlighted by the shimmering moon and the only music to be heard comes from the whistling wind and the rippling currents of the nearby ocean.