Sometimes the routes converged, as in his "Tectonic" series, with its juxtaposition of gridded structures and flowing liquid surfaces.

By the late 1960's he was one of the leaders of the movement that became known as Conceptual Art, and was transferring his gridded structures into two dimensions by drawing them on walls.

And it would not be until the advent of Minimal art that the whole, static volume of Mr. Lassaw's gridded structures would find a truly convincing expression.

His public commissions are inclined to rely more heavily on "gridded structures," whereas windows for private residences flow with more "flexible structure."

Focusing on all-white gridded structures, the uptown show has a strikingly coherent beauty.

The roofline is three parallel gable roofs and the external elevations are distinguished by a repetitive gridded structure.

There are multilevel shelves, abstract gridded structures, yardsticks held in place by clamps, desk lamps projecting every which way, a miniature flight of spiral stairs and a plant with round, bright green leaves.

How about the Pulaski Skyway, the wonderful gridded structure over the Hackensack and Passaic Rivers?

Mr. Barbeito specializes in transparent gridded structures that move out from central, seemingly molten cores with a Big Bang opticality.

At certain points, small-scale gridded structures made of layered paint project several inches from the surface.