---

• s  not limiting the reference of a modified word or phrase
  the nonrestrictive clause in `I always buy his books, which have influenced me greatly,' refers to his books generally and adds an additional fact about them

• But his white sideburns were so overcompensating--two enormous parentheses bracketing the nonrestrictive clause of his face--that he is seldom thought of as bald.
• Men can try to cool themselves with air-circulating beaded car seats, air conditioning and nonrestrictive clothing, such as boxer shorts.
• Paulette, a tiny girl with a large pompadour, dutifully marches to the blackboard and, in a spidery hand, diagrams a sentence with a nonrestrictive relative clause.