Golf balls are really, really weird. Especially the old ones used over a hundred years ago. The dimpled shell can hide things like goose and duck feathers, wound rubber and all other sorts of colorful and bright polymers and rubbers and plastics. The current balls are super fancy, I wish each golf ball still hid the rubber that looks like tobacco leaves.
This video, by Golf Digest, just re-confirms how cool it is to see things split in half.