What principle does Vase Design commonly utilize in floral arrangements?

Vase design in floral arrangements fundamentally emphasizes the placement based on structure. This principle is crucial because it ensures that the arrangement not only looks aesthetically pleasing but also maintains balance and stability. By considering the structural integrity of the flowers and foliage being used, a designer can create an arrangement that explores height, width, and overall cohesiveness. Proper structural placement allows for the natural beauty of the flowers to be highlighted, while also ensuring that the arrangement can stand on its own without tipping over or looking cluttered.

In this context, while heavy foliage can certainly add depth and volume to an arrangement, it is not a primary principle of vase design. Similarly, incorporating water features can enhance the visual appeal, but this focus doesn't align with the fundamental principles of structure. Attention to vertical lines is an important design aspect, but it's part of a broader consideration that falls under the structural placement within the vase, rather than being a standalone principle specific to vase design.