Thank you everyone - my kind of gut feeling about the throughways is that he creates a boundary, so if he hears an outside noise he will move to form part of the perimeter of a boundary with the furniture (and me in the middle somewhere) almost as though he has created a safe space for me to be in as anyone coming in in the room would have to step over/move him. I have watched him make so many moves I think they are well thought out ............... but of course I can and mainly do chose to ignore them
Our living room is one that you have to walk through to either get to the kitchen and out into the garden or in the other direction takes you to the hall, stairs and front doorway - a bit of a nuisance when we are all in and moving around the house.