How Pearls Obtain Their Remarkable Symmetry

While pearls lack carefully planned symmetry that keeps brick buildings in order, pearls will maintain symmetry for 20 layers at a time, which is enough to accumulate consistency over its thousands of layers. In a way, the pearl “self-heals” when defects arise without using external scaffolding as a template, comments Pupa Gilbert, a physicist at the University of Wisconsin-Madison who was not involved with the study, to Science News.