What metaphors are used in Walden Two by B. F. Skinner?

Walden Two conducts a number of "ethical excercises" with its residents. One of these excercises is used with young children. The children are given lollipops coated with powdered sugar. Because the powdered sugar makes it easy to see if they've been licked, the children are told that if they can avoid licking them, they will be rewarded with them at the end of the day. The solution to the exercise is to put the lollipops out of sight and out of mind. Burris uses this as a metaphor for how Steve should handle his dilemma with Barbara..... put her out of sight and remove the temptation.