How does Don Miller use imagery in To Own a Dragon: Reflections on Growing up Without a Father?

Imagery:

"And I remember wondering what it would be like to own a dragon, to lie across the monster's spine, inching toward its neck as the beast jolted into flight, thrusting through the milky pretext for heaven that glows over Houston, up and above the weather where my dragon and I could watch lightning fight itself into exhaustion."

"Perhaps it was because I was operating on so little sleep following a trip I had taken - or perhaps it was because Father's Day is a foreign concept to me, like celebrating relationship with aliens - but on a particular night, I felt my soul collapsing."