Zen Vases are thin glass vases mere inches wide, lovely for the simple elegance of presenting a few spare flowers. The beauty comes from the purity, the lack of distractions.
The husband of the husband-and-wife team originally did paintbrushing and lacquiring in a spartan, Zen style; the wife originally did ikebana (Japanese flower arranging). It's easy to see how both of them contributed to the design of these vases.
Another booth also sold similar acrylic vases. (I forget the name.)