What will take to sense and store all the variables that determine the dynamics of a large city? A list that includes:

1. Migration, both in and out.

2. Material inflows and outflows — food, industrial production, construction materials everything

3. Pollution, solid waste, effluents and other byproducts of human activity.

4. Health, education, livelihood statistics.

and so on. In other words, what will it take to convert a city into a fully sensible organism?