How does Jordan Sonnenblick use imagery in After Ever After?

Example of Imagery:

"But if a regular, ordinary relationship is like juggling a bunch of different-size, jagged pieces of metal - and from what had been going on between my brother and Annette, that seemed to be a pretty good simile - then throwing cancer into the mix is like juggling a bunch of different-size, jagged pieces of metal while riding a skateboard on the edge of the Grand Canyon"