A motif is a recurring theme or element in a piece of literature (www.dictionary.com). There are several motifs in "The Rocking-Horse Winner": Oedipus complex, responsibility, and generosity and greed (www.enotes.com). Briefly, Paul has taken the place of the father by providing money to his mother through his horse racing predictions; also, he has taken on the role of parent through responsibility for providing for them monetarily (ironically, it should be the parents taking care of the children); finally, Paul is extremely generous by giving the money he has won to his mother without question (but she spends it on material things instead of saving it); finally, greed is an obvious theme in this story--his mother is horribly greedy and doesn't express to Paul how much she loves him, etc. She is not a good mother. D.H. Lawrence definitely is a true master of the motif through his strong use of theme and symbols (for example, the rocking-horse represents a way of life/money in the story).