The pompon dahlia form — concentric rows of petals, each row slightly smaller than the last, assembled from the outside in — reads as architectural in a way that most flowers do not. It is one of the largest pieces in the collection and carries this with the composure of something that has thought carefully about scale and arrived at the correct conclusion. The Powder Blue Aphrodite Dahlia is 6.3 inches across, hangs on one screw, needs no water. It has never made a shy decision in its entire existence and is not about to start.