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The practical work presented in this paper uses a GA to evolve a cellular automata (CA) implementation of a binary numbers adder. One very useful way to compress the enormous search space and eventually find an optimal CA consists in adopting a macro-coding of the states and the rule table. It is further discussed how this work illustrates and defends our favorite position in the currently vivid epistemological debate around the notion of “emergence”. This position is Crutchfield's “intrinsic emergence” one, in which to say that a macro-property is emergent requires that this “property” supplies some mechanical and non-human observer with additional functionality.