Final answer:
Robertson uses the analogy of fallow fields in agriculture to explain the concept of boredom and its psychological significance.
Step-by-step explanation:
The analogy of fallow fields is used by Robertson to explain the concept of boredom. He compares boredom to fallow fields in agriculture, which are left without any crops for a while to allow them to regenerate.
Just as fallow fields need time to rejuvenate and regain their fertility, Robertson suggests that boredom serves a psychological purpose by allowing the mind to rest and recharge.
By using this analogy, Robertson emphasizes the importance of boredom in promoting creativity and mental well-being.