A galois lattice shows the distribution of industries by taking the set of all cities (yellow node) and breaking them into sets according to attributes (green and red nodes) which may intersect (pottery is found ONLY in cities producing paper) or may note (sets that intersect at the lower node 7). When city sizes are added as attributions (previous link to slides with green background in a time series), the addition of extra information makes the lattice more complex.The discrete structure diagrams give a direct idea of combinatorial complexity.