This is a demonstration arrangement that my wife made for her students yesterday. It is a "form linear" arrangement.
The onions on the matching s-shaped stalks are "Allium Cepa Judith". The purple flower is "Liatris Spicata" and the tall flower at the back is "Leucadendron". There is also an Iris peeping out at the bottom and the large leaves at the back are Aspidistra.
Of course, I knew all those names (not!).