Living organisms may show 'nonliving-pattern' building.
(left) The leaf patterns show self-similarity, a concept that has been studied extensively in the last decades, and fractals are defined by it. The leaf consists of little copies of itself, and after that once again.
(bottom right) The veins of this leaf do not form a tree pattern, for they are linked.
(top right) Some patterns arise in different living structures. This is a recolored photo of a slice of roastbeef.