There are several "second-order" visualizations that would be very intriguing.
For instance, we could superimpose the boat traffic model that Steve and Fabio are proposing in Venice on the "slow real time" permits to show the "faster" real time effects on boat traffic (taxis) — for example as a consequence of the creation of a new hotel somewhere through a "cambio d'uso" (change of use) permit.
Likewise, a "slow" change — such as the creation of a bulky scaffold around a building — would affect the pedestrian flows in the streets, which Steve and Fabio are also exploring in Venice (in the context of simulated evacuations from St. Mark's square in case of terrorist attacks or other calamities).
Another model we could superimpose could show the transformation of the retail sector, which we also have recently studied, or possibly even tourism.
We should try to leverage as much of the past research as possible, so we could fairly quickly show these higher-order visualizations. Then we could also think of completely new models/visualizations that would go even beyond that.

We should also, as icholas suggested, project the models of the past into the future.

I think the weakness of the current idea is in the absolute reliance on the permits data in order to model everything else. It's a very critical aspect. We should envision an alternative plan B.

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