How does William Faulkner use imagery in Intruder in the Dust?

Imagery:

And standing at Highboy's head among the trees and undergrowth, his other hand lying on the horse's nostrils in case he decided to nicker at the other animal, he heard it too—the horse or mule coming steadily down the road from the crest. It was unshod probably; actually the only sound he really heard was the creak of leather and he wondered (without doubting for one second that he had) how Aleck Sander had heard it at all the two minutes and more it had taken the animal to reach them..."