These are further divided by rectangular furniture, like beds, tables, cupboards etc. Outside our houses are more divisions. A fence divides one garden from another. We can either be on one side or the other. The fence is a symbol of property demarcation.
Nature is oblivious to such abstractions.
Just look at the fuss some people make about an overhanging tree from a neighbouring garden. It's a denial of the true nature of the universe, which is not so politically conventient. It might look more like a hedge. A very short hedge, perhaps. It might be no taller than grass.