not knowing your neighbours names

I once heard a parcel courier ask for the flat above me by name and I thought, oh, so that is who lives there.

We nod. We have a nodding relationship of considerable warmth and no information. If there were a fire I would have to shout "hey" at four doors.

Two years in this building. I know the dog is called Biscuit. I know nothing about the man who walks it.