The suggestive seed is a coco de mer, or "nut of the sea ... beneath the central dome near the conservatory's prized philodendron. And then they'll wait. And wait. And wait some more, because ...

In these depictions, Egyptian goddess Nut can be seen arching over the Earth god Geb, forming the sky. With her hands and feet touching the horizon, her body forms a protective dome over the world.