What are the motifs in Dandelion Wine by Ray Bradbury?

Man versus nature is a recurring idea in the novel. On the first outing to the woods, when Douglas discovers he is truly alive, his father describes the difference of taste in nature versus indoors. The first time Douglas crosses the ravine, he thinks about how man can't really tame nature as the ravine's wild growth keeps creeping back on the town. Grandfather wants nothing to do with man's convenient devices as they separate him from the pleasure of living things. The theme also appears in many other individual stories. When Leo Auffmann tampers with man's understanding of happiness, the results are disastrous but eye-opening. The sisters, who own the Green Machine, realize they may not be powerful enough to rein its energy after running over a man.