Why do we put pillows on couches?

My wife insists that the couch in our living room needs to be covered with pillows when we aren't sitting on it. This results in pillows perpetually being scattered around the room, and her getting angry with the family for not putting them back when we're done with them. What social convention drives her... show more My wife insists that the couch in our living room needs to be covered with pillows when we aren't sitting on it. This results in pillows perpetually being scattered around the room, and her getting angry with the family for not putting them back when we're done with them. What social convention drives her to insist that the pillows need to be there?
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