The Wisteria Table Lamp (Clara Driscoll - Tiffany Studios, c.1905) has a cylindrical shade topped by a dome, so it is a geometric form. But the bottom of the shade has an irregular edge ...

“Using geometrical forms enabled me to understand what I was doing, it helped me to tell things in a clear language,” he once said. “I wanted to create a kind of alphabet of elementary and impersonal ...