When I went to see the "Birth of the Cool" show in Oakland, I fell in love with Karl Benjamin's work. I gained an even great respect for the man when I read an interview via a link that Joanne Mattera so kindly provided. His work will be at Brian Gross through September 5th so you've got about another week to see it. I'd say he is the precursor of a lot of current geometric work, including that by Joanne, Eva Lake and maybe even "our" own Chris Ashley. In any case, it's work by a smart, unique man. You really can't appreciate geometric work until you see it in person; a reproduction doesn't do justice to the colors, forms and the way they interact together. As Ms. Jancar pointed out, the location doesn't do justice to the pieces. Like Pia Stern's work, they are meant to be seen in a far less frenzied and commercial location - but having them up, even in the busy lobby of an office building - is better than not having them up at all.
At the satellite location: #1 Post St. Lobby Floor
Link to interview: http://www.geoform.net/features/features_benjamin-1.ht