Sajjad Afzal-Woodward of worldsystema.com recommended this to me:
A CITY IS NOT A TREE by Christopher Alexander
Excellent, fascinating piece...highly recommended, with excellent graphics that clearly explain the concepts. It reminds me of what Turing (I think?) said: humans will never be able to design a machine as intelligent as a human, but they might be able to grow one...
The basic principle of semilattice that Alexander lays out sounds like one of the "lost laws of rhizome". Where are the rest?