The person returning home after hosting feels a different emptiness from the traveler leaving.

Two people can part at the same door and feel nearly opposite things. Whoever is travelling moves into novelty, with the next arrival to think about; whoever stays walks back into rooms still arranged for company that is no longer there. Neither loss is larger, though they are not the same, and each can look like indifference to the other. The house is usually quieter than the train.

After a visit ends, say something to the person on the other side of it within the day. If you were the guest, message when you arrive. If you stayed behind, allow the flat evening its shape.