Why do dark-coloured flowers appear heavier than light-coloured flowers in an arrangement?

In the context of floral decoration, dark-coloured flowers appear heavier than light-coloured flowers because colour values directly influence the perceived stability of a design.

Even when two flowers are identical in physical size, a darker hue possesses greater visual weight than a lighter one. For instance, a deep red rose will appear heavier in an arrangement than a pale pink carnation of the same dimensions. Because of this, designers must be mindful of colour placement; if dark colours are massed at the top of an arrangement, the composition may appear top-heavy or unstable to the viewer. Achieving a balanced design often requires careful consideration of how these visual weights interact with the overall form and structure of the arrangement.1