Art is about itself. An excellent article here - "Why do we need art?" - about its roots in human celebration and expression in all ways. It connects people by "making special" the experience of being in a place.
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Our perceptions are also explored in this article "This is Your Brain on Architecture".
The organizing principles of architecture began with practical site constraints and protection from the elements; it is part of the land, an earth science. This later evolved into expressions of larger monumental structures that expressed the central community organizing principle, basically churches, temples and pyramids. The euro-centric history of the built environment is the history of churches built over several lifetimes, usually because most early cities and towns had homes/farms, stores and the central church, which expressed their community values and allowed them to congregate. Then came schools, specialty civic buildings and libraries, all still "monumental" to express continuity and stability. Banks became temples of commerce. Industrial revolution brought factories and weapons manufacture (no more ironsmithing those old flintlock muskets and cannons) and an explosion of building types in now-urban areas, including trains and shipping transport. Automobile production finally destroyed everything, thankyouverymuch Henry Ford.
Portovenere, Italy Sept. 2000