A simple analogy would be:
A is to B as C is to D
But why not take this further and say:
"A is to B and C and D, and B is to C and D, and C is to D"
"a is to b and c and d, and b is to c and d, and c is to d".
That is to say, find a web of analogies (or, one might say, an analogy that is a web). This is what I think any good GBG is leading towards. (NB This is what the mathematicians call an isomorphism.)
I would add that any semantic web (such as the book) contains analogies and metaphors about one's existence as it relates to all other existence. I am to You as You are to Someone Else as They are to Me and to You.....