Why Formica? What is the aesthetic value of blue as opposed to green? What convention is being challenged by a beverage in a jar?
These questions requires a subtler analysis of a once "common" phenomenon, and subtlety is hard to come by in our society gross sensory experiences (times square, multi-media,etc.)
Art allows mundane things to be raised out of mundanity where they can take on much deeper meanings from being approached from a more holistic perspectives:
How does this make me feel? What is the cultural relevance? How do these things relate to each other and to everything else? the list goes on.
It is said that "humans are social animals." If this is the case what practice of art would have the most impact on the most people? Would it be an object created with nuances which can only be perceived by those who know about the technique and history of the object or is it something that is more universal. I would think the latter. From the time before we are born we are interacting with another human (our mommy,) and unless one manages to be a pure hermit (in which case they are not really relevant in this discussion,) one will continue to interact with society until they die. Social Practice is merely empowering us to question our assumptions on our basic modes of interacting with each other with the possibility of greater understanding.
By being forced to see our experiences from a another perspective than we do in our habitual ways of being one invariably becomes wiser. Let us be art every moment and realize our power and infinite possibilities and throw off the shackles of our autopilot existence.