Natural branching
June 24th, 2007 by WesKarmen at Chaotic Utopia gives us a look at branching patterns in nature through the life cycle of a decaying leaf:
We begin with an aspen leaf, which landed on a bed of new fallen snow. Weeks of gentle sun warmed the dark leaf and melted the surrounding snow. In that tiny pool of water, the softer parts of the leaf began to decay, revealing an intricate network of veins.