@Tri2Cook - Well, to my eye it’s because you have something as resolute and brutalist in form as a solid, tall cylinder of cold-looking concrete-like cake, you want to contrast it with something more organic and whimsical in form and colour.
Otherwise you have a plain pylon of cake that calls for SOME decoration; flowers would look wrong, ribbons or sprinkles similarly incongruous, spiky chocolate shards too similarly cold. I think the height and drama and organic curves of a sail are just about the perfect decoration to contrast and set off the concrete-yness of the cake beneath it.
Although, I was going to paint the whole sail in metallic copper lustre dust instead of marbling it, but changed my mind at the last minute.
