I'm reminded of a time (a time that is still happening in many parts of the world) when a room had many uses: eating, sleeping, working. And only the time of day or position of a table would declare that room's current purpose.
In this case, there was/is no parlor or den, no kitchen or dining room, no bedroom or sleeping porch. There was/is just one room. The living room — though it was not called that. People were too busy living in it to name it.
In summer, we're always moving our chairs (and tables, too). It's delightfully disorienting. So the message, then, is this: Look carefully before you sit; make sure there's something there before you do.