I think very simple systems can result in very complex and unpredictable patterns. It is not so much that they are without cause, we just can't measure accurately enough to get a reference point.
carry on don't let me interrupt ... 
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There is a theory which states that if ever anybody discovers exactly what the Universe is for and why it is here, it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another theory which states that this has already happened. ........... Douglas Adams |