Knots on a String

I've tried to find a good metaphor for how it is that the Spirit of God can dwell in all of us, that we may be one, and yet we are all separate and distinct spirits.  The metaphor I've found I like the most so far is that the Spirit is a piece of string, and all of our spirits are knots along that string.  Each knot is separate and distinct from the other knots, but they are all the same string.