I have a little shadow that goes in and out with me,
And what can be the use of him is more than I can see.
He is very, very like me from the heels up to the head;
And I see him jump before me, when I jump into my bed.
Robert Louis Stevenson
What could be more intimate? Sticking to you through thick and thin, 24/7, always at your heels? Here is my life companion’s life companion —
And this is my own other companion —