I took a backstage tour of Lincoln Center back in 1991, as I visited there the first time. The tiny, crisp, old lday who took us around said she was an actress. Then I saw her again at the State Theater in 1993 when she was an usher. I began visiting the theater every spring (I was then living in Tokyo), and looked forward to seeing her every year. Mr. Balanchine was already gone, but I saw Robbins and Kirstein in the audience. I am sure I saw her quite often in the 1990's at the theater ... yes, at the first ring ... could she have been Ms. Thyssen?