What makes Dubrovnik’s urban fabric cool?

What makes Dubrovnik’s urban fabric cool?
Looking at the plan of the town above, you’ll notice that all the gray areas are buildings, and all the white areas are pavement. At first, the ratio of building to pavement seems normal. Then, when you compare it to an American town you’ll often discover the plans are the inverse of this! Why? The Dubrovnik plan doesn’t have any roads, which also means there are no parking lots.
The big pavement areas in the Dubrovnik plan are either piazzas or
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