Guggenheim Museum in New York, there’s one little picture that got me through a tough winter: a watercolor in frosted blues, by the Dutch artist Piet Mondrian, of a solitary flower. It’s ...

On Dec. 24, with memories of the calamity of Sept. 11 still fresh, The Chronicle published my reflections on a painting by Piet Mondrian that the San Francisco Museum of Modern Art owns and displays.