How does Vladimir Nabokov use imagery in Invitation to a Beheading?

Imagery:

"Cincinnatus got up, made a running start and smashed headlong into the wall—the real Cincinnatus, however, remained sitting at the table, staring at the wall, chewing his pencil, and presently shuffled his feet under the table and continued to write, a little less rapidly."

"The game dragged on for a long time. M'sieur Pierre would grow purple, stamp his feet, fume, crawl under the table after the dice and emerge holding them in his palm and swearing that that was exactly the way they had been lying on the floor."