This is because one moment is fundamentally disconnected from the next. Likewise, no matter how well you know a person or how strong the bondage is between you there will always be moments of friction, of tenderness, of conflict. Organisms are irritated by their environment and relations, but they are also irritated from within. We may say that organisms are wounded wholes. This woundedness is captured in the concept of wilderness.
Human order is the opposite of mess.
We tend to look at order as control and rigidity. But the order that emerges in complex systems is soaked with an element of wilderness. And a wild jungle stands in stark contrast to the well-trimmed gardens of the human world. Neither the jungle nor clouds nor organisms are ordered in a traditional sense, yet they are not completely disordered either. Somehow we get the feeling that nature balances somewhere between chaos and order.