Brooklyn Bridge Park has plenty going for it already: the waterfront promenades, the little corners where you escape into nature, the playgrounds and soccer fields. But it could use more wide-open green space, places to picnic or throw a Frisbee, the kinds of free-for-all gathering spots synonymous with the exercise of democracy and the flirtations of sunbathers. And another architectural landmark in the city never hurts.

Voilà: A new plan, which should win city approval shortly, would give Pier 6, off Atlantic Avenue, a flowering meadow with seasonal grasses, a sprawling field and a triangular wooden viewing platform. That’s at the southern end of this spectacularly successful 1.3-mile-long Brooklyn park, where there’s already a maze of children’s playgrounds. The meadow and field would add breathing room to the pier and a mini-Great Lawn floating serenely over the East River.

More to the point, the proposal also envisions a new work of public architecture whose distinctive shape its architect describes as a manta ray.

A manta ray or, maybe, a humongous Tostito — in any case, a triangular platform, stepped and undulating, doing for Brooklyn Bridge Park sort of what the Boathouse does for Central Park. Creating a visual anchor for that end of the park as well as for the riverfront, it would become a perch from which to look not just over the harbor but also back at Brooklyn.