When it comes to urban planning, people love narrow alleyways that are full of overhangs, balconies, and bustling life, similar to what can be found in many European towns. New Orleans Square is a master example of this. Mind you, wide boulevards with grand showcasing are likewise desirable, but send a different message than the comfort of a narrow corridor.
Just to visually make my point, here is Catania in Sicily, Italy. Incredibly quaint and charming, making those who see it feel nestled in a place of comfort.
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In contrast, here is the Louisiana Purchase Exposition of 1904. While it lacks the intimacy of the above, it fulfills our desire for grandeur.
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Applying these to Disneyland and Walt Disney World, Disneyland mimics that of the former, and as a result creates a natural sense of feeling at home due to its intimate setting. Walt Disney World, on the other hand, is an impressive feat that resembles more of the latter, at least in theory, though I'm of the belief it does not commit properly and fully to the idea, preventing it from captivating in the same way something like the St. Louis World's Fair manages to do.