> Only a very tiny proportions fit into that category Actually, it is exactly the other way round: most problems in the real world are about local communicatio

> Only a very tiny proportions fit into that category Actually, it is exactly the other way round: most problems in the real world are about local communications of cells in a 3 dimensional lattice. Including, relativistic limits to communication. So an ideal architecture for that is a 3D cellular automaton. With bigger cells, you've got nodes on a 3d mesh (torus). Incidentally, the topology of most supercomputers.