How does Bill Bryson use imagery in The Life and Times of the Thunderbolt Kid?

Imagery:

"The school day was largely taken up with putting on or taking off clothing. It was an exhaustingly tedious process. It took most of the morning to take off your outdoor wear and most of the afternoon to get it back on, assuming you could find any of it among the jumbled, shifting heap of garments that carpeted the cloakroom floor to a depth of three feet."

"Happily, we were indestructible. We didn't need seat belts, air bags, smoke detectors, bottled water, or the Heimlich maneuver. We didn't require child-safety caps on our medicines. We didn't need helmets when we rode our bikes or pads for our knees and elbows when we went skating. We knew without a written reminder that bleach was not a refreshing drink and that gasoline when exposed to a match had a tendency to combust."