How does Peter Cameron use imagery in Someday This Pain Will Be Useful to You?

Imagery:

"My father has never remarried—the woman he left my mother for died, suddenly and tragically, of ovarian cancer before they could both divorce and remarry, cancer moving more expeditiously than the court system..."

"There is something inherently depressing about an empty watercooler—none of that is it half-full or half-empty, just empty - and I thought if I were a shrink and had a water cooler in my waiting room I would make sure it was always filled."