And when the walls become too tall, one must decide if windows and/or doors will be added.
Perhaps opening a window periodically for some fresh air.
If one decides on a door...first ask "Who goes there and state your business?" Then decide if they will be allowed in as a guest or something more permanent and eventually allow them to stay indefinitely.
Then again, maybe there will be only a peep-hole in a solid wall so one can observe but not participate. Or build it solid with no openings, slowly walling oneself in. No communication at all.
Once built, they are hard to demolish.
I would prefer no walls. No boundaries. Where everyone could come and go as they wish.
Or maybe, if I were transparent, they could pass right through me, exchanging information on the way. Both would then know if the communion is worth it. In fact that would be quite practical. It would save a lot of misunderstood rhetoric. No misinterpretation. You would know immediately if any sort of long term relationship would be possible. You would know if it would be merely a physical relationship, a friendship or a romance.
Of course that would take the wonderful complications out of it as well. The shy hesitations, the wonder, the magic and mystery, the heart-pounding anticipation.
It would make it easier, you would know immediately if it was ‘meant to be’. If you were ‘cohabitable’. You would not later feel regret for something you failed to do or say. A missed relationship. A friendship never allowed to blossom.