How are the brothers contrasted? Why is Roy attracted to the rock pile? Why is John afraid of I.T ?

John is not as adventurous as Roy and is in fact afraid of Roy's friends and the rockpile on which they fight. John tries to stop Roy from sneaking out to the rockpile, but Roy, although he is younger, has a stronger will than John does.

Roy is always looking for trouble and finds it in the rockpile located across the street from their apartment.