That Tuesday evening, the rain fell in rhythmic cascades against the windowpanes of the Bibliothèque, transforming Mercer Street into a shimmering mirror of SoHo’s cast-iron facades. In this neighborhood where fashion houses stand like sentinels guarding the secrets of style, one expects to find spaces that perform rather than simply exist. Bibliothèque performs, yes, but with the quiet confidence of a veteran character actor who does not need histrionics.