When two chemical compounds interact and simultaneously mix and react, they can form surprising stable organic patterns.
Turing, the father of modern Computer Science, suggested that this behavior of forming a regular pattern of spots is the sort of thing that might be used in nature to grow the patterns on the skins of leopards, for example. It was only in 2006 that the first evidence of such phenomenon was found, in the even placement of hair follicles on the skin of mice (and more recently for the ridges in our palates).
Another related pendant can be found
here.