Mother Nature's skill

I have had this seedpod for maybe 40 years or so, following me around the world when we lived in several different countries many, many years ago. Along with three or four other different kinds, I picked up this gorgeous seedpod on a tropical beach in Seria, Borneo. Isn't it just amazingly intricate? I've seen man-made carvings similar to this, but never a natural creation so beautiful. I guess the seedpod is around 2" in length. Does anyone know what it comes from?