Many simple models exhibit self-organization (the
spontaneous development of complex structures).
Models with symmetric rules can have highly
asymmetric behavior (symmetry breaking).
Some effects may not have easily identifiable causes.
The 2nd law of thermodynamics (increasing disorder)
is not violated since these systems are far from
equilibrium (driven by energy flow).
If there is intelligent design in nature, it is at a more
fundamental level (the underlying laws of nature) than
its proponents commonly suppose.