Adjustable Vases

Invention for the day. I would like vases to have adjustable necks. Because with floral arrangement, quantity is important relative to the size of the vase. But, most people only have one or two vases in their house. So, a small bouquet of flowers often flops around the wide neck and can look rather skimpy. But, if the vase neck was adjustable to become tighter dependent on the amount of flowers purchased, you could perfect the look of any arrangement. Any venture capitalists out there?