Why do we have an affinity for certain things for seemingly no reason? Art is a good example (although the question isn't limited to art). Why do you prefer certain types of art, where other people have a different preference? Why even like art in the first place?
I don't have much of a clue. I assume the reason we like different types of art (in my example) is due to differences in personality that somehow effect it. I'm not sure why we even like art in the first place though, but I think it's for social reasons. To admire the artists skills and to communicate with people who like similar art...?
Necessity perhaps? I think art (chronologically) followed engineering and helped developed the first economies.
Explanation: If there was a lack of something in pre-recorded history, it had to be built. From there, if I use an example of a house, it had to be adapted to the climate or simply improved upon. Some would be better at this than others. And each individual would do things differently by natural default and physical strengths and weaknesses. (Two Impressionist painters can paint the same flower, and it could be done in two vastly different styles.)
And that's just a beginning of the variables possible.
Anyway, the houses of an area and peoples would start to develop a look, an aesthetic initially based on need. And all the variations of the various builders of houses will become apparent. As time passes there will be different needs of the owners and this too will influence how the structure is built, bringing in the personal preferences of people beyond strict necessity. As to the economy thing, if X can build my house better than I can, why not
bribe pay him to?
I'd guess that art was the evolution and refinement of necessary things until the environment of the artist/engineers and people was secure enough for it to be expanded into things that are not strictly necessary, but nice to have anyway. To be overly dramatic, "Art is Progress!"
Just an, unrefined, theory.
Regards,
Opium.