I'm convinced that the re-entrant self modifying sort of logic exhibited in this toy program is similar to the logic used in DNA --> protein construction, i.e. a single strand of DNA can construct many different proteins depending on where and how it's sequenced. I also think the primitive logic of the brain at the neuron level uses something like this. Finally I've got a sneaking suspicion that quarks at a deep level are also self referent like DNA and brain neurons. This notion of a single over riding logic to the entire universe is attractive to me. Needless to say this kind of programming is very hard to do but has enormous power.

Gary