How does Ben Mezrich use imagery in The Accidental Billionaires: The Founding of Facebook: A Tale of Sex, Money, Genius and Betrayal?

Imagery:

"Eduardo sat next to Mark in the back row of the balcony, watching as Bill Gates mesmerized the gathered crowd. Despite Gates' strange, almost autistic mannerisms, he managed to toss off...some pearls of wisdom—that AI was the future, that the next Bill Gates was out there, possibly in that very room."

Sean Parker was like a jittery little comet tearing through the atmosphere; he'd already burned through two start-ups. The question wasn't if he'd burn through Facebook as well, it was when."