Function of urban spaces

There are these spaces that are created for specific purposes:
cafes for eating and drinking
bookstores for browsing and buying
bus shelters for waiting
roads for walking
galleries for looking and talking about art

...

There are implicit rules with such spaces, that there is no flexibility in using
them for other functions. Like, you have to at least buy a drink to be in a
cafe. If you are tired, there is no place for a nap unless you go to a hotel or
hospital. Well you can sleep in bus shelters but you end up looking like a
homeless person.

In the wild it is a different story