The white flowering Protea dracomontana bushes have green-barrelled buds, the white of perianth tips announcing their appearance in the parting on top. The recently fully opened heads have woolly cones on top, styles angling outwards lower down, resembling rondavels built by some indigenous tribes.
Flowers are good sources of ideas to humans, clearly also in architecture (Rebelo, 1995; Rourke, 1980; iNaturalist).